Oath of conquest Paladin build progression

Hey guys,

I posted this in general tips, but I thought it would be better fitting here.

We are playing as party of 5 players. A rogue dwarf, a variant Human wizard, a half-elf artificer, a goliath barbarian and my high elf Paladin. We are playing by 2014 rules mostly(which is good for Paladins I would say), initially the DM, who is a new DM although he is very dedicated and learns fast, told us to adhere to the strict racial bonuses as standard, but then later since there were some mistakes in some sheets we were allowed to redistribute our points using the optional customized distribution rules, either the 2014 tasha's optional rules or the 2024 backgrounds' rules, each player could choose between these, but we should follow it strictly and not mix both, you had to follow either one of them and the skill proficiencies it dictated. Under my suggestion he also allowed us to pick between the 2024 feats and half-feats version and the 2014 one, we could choose any feat or half-feat from either one of them(at ASI/feat stages) which I deem good. 

We are at level 7 currently, we are just about to get to level 8(probably next session), until level six we were playing with full health dices, then the DM chose to restrain our HPs until we equalized with the expected number for our level(which would be level 9), and we all started really strong because of the full health dices and initial magical items(even overpowered I would say), but it was fun and now he is balancing it more. Because of the optional customization of racial bonuses, in my case following the 2024 background rules, I was able to get acceptable stats for a high elf which isn't usually the best choice for Paladins, but I think it is thematically very fitting. Our campaign is mostly RP heavy but there are little spices of power gaming, although this is not the focus and narrative cohesion is preferred. My character is an Oath of Conquest Paladin with 15 strength, 12 dexterity, 14 constitution, 8 intelligence, 10 wisdom and 17 charisma, since his background is Noble, he got the origin feat skilled, counting everything his proficiencies are History, Perception, Insight, Persuasion, Intimidation, Medicine, Athletics, wisdom and charisma saving throws, quite a lot for a Paladin. Since my character has a very heavy lore and is somewhat the party face, checks in general and social checks in particular are very important for him, that's why I didn't want to dump wisdom or intelligence completely and keep him good but balanced. Because he is an elf and comes from a noble house especialized in warfare among the high elves(he has important military positions in his kingdom), I leaned into the longbow as well, despite the Greatsword being his main melee weapon, that's why his dexterity is not so dumped. I want my character to be powerful but I don't want to fully min-max, I don't want him to lose his skills at checks that are important(like Perception and Insight), his stats are not higher than that because of it and due to choosing the Fey Touched half-feat at level 4, that's why my charisma currently sits at an uneven 17. But Fey Touched is a very good feat and very useful for a Conquest Paladin. I have of course Misty Step and Silvery Barbs as my spells, Silvery Barbs is great for a Conquest Paladin. My character wears a full plate armor, uses the defense fighting style and possesses the Necklace of Prayer Beads with the first 3 beads(Bless, Cure Wounds and Greater Restoration for now) and a very strong Wakened Dragon's Wrath very rare Greatsword, we were allowed at the beginning to choose either a very rare item or two uncommon and one rare, yes I know, completely OP.

So now I am stuck on what to do on level 8 and then forwards between feat/ASI progression and the possibility of multiclassing. I might not want to multiclass, I am not sure yet and the DM said he might not allow it, he is still thinking about it, so I can't really rely on that. If I only choose ASIs I will be able the max both strength and charisma by level 19(our campaign is expected to reach level 20), but not before and only if I ignore feats and half-feats. But I was very interested in picking GWM(2024 version) half-feat at level 8, which would increase my damage considerably and give me occasional extra bonus action attacks due to the triggers, especially killing enemies, extra attacks are always valuable for Paladins. I know that people talk about Polearm master, but I find Greatswords much cooler and my weapon is incredibly strong, so not for this feat, also as a consequence of that no shields or shield based feats. My question is, what would be better:1- go full ASI all the way until level 19. 2- pick GWM at level 8 and round up my strength. 3- pick Sentinel and also round up my strength, which triggers perhaps even more extra attacks than GWM. 4- pick some charisma based half-feat like warcaster?. 5- Pick any other full feat and sacrifice my stats progression. In this option I thought about magic heavy feats like Metamagic Adept or Magic Initiate. I should say that both look much better mechanically than Warcaster, which to me is not so good for my build. If I choose a half-feat at level 8, I will have to choose another half-feat at some other level, because mathematically either strength or charisma would end up at 19 if I did not do so. I also saw that Squire of Solamnia is a very good feat, the advantage it gives and the extra damage, but especially Knight of the Sword looks great, which also increases my charisma and allows me to trigger the fear effect without spending resources. I would pick Knight of the Sword if I didn't have to pick Squire of Solamnia first and then damage my stat progression, but it is not allowed, I don't think the dm will allow it.

So what do you think? in most cases people would favor charisma because of the conquest build, but besides the hard to get Knight of the Sword, the strength based half-feats are just better and they increase my damage a lot(especially GWM), they combined with my 4 d6 +2 damage sword is really OP. I want to maximize my charisma, but my strength is alredy lagging  a little behind, so I am in a very difficult MAD dilemma. And although unlikely, what do you think about multiclassing, in our table it would have to fit the lore, so proably warlock builds would be off the table, I see Battlemaster Fighter as a good option, especially with this sword, also as far as I know, Hexblade warlock does not allow a two handed Greatsword.

Mechanically, that 15 Strength and 17 Charisma makes the ASI increase at level 8 to both so strong: a +4 to all saving throws and social skill checks (in the campaign you're describing in particular) sounds really good, and bumping STR 16 is noticeable bump to accuracy. GWM (2024) would be the better damage option though.

There's not much I can think of to capitalize on Oath of Conquest as a choice at this point (if you had Squire feat/could go into Swords, that would compliment it really well, but that ship has sailed).

You only good options.