I screwed up my Rouge/Warlock, how can I mitigate it?

At the moment in the campaign, my Gnome character is cursed to be a Warlock as well as a Rogue (this was a choice in arc, not forced. my dm isn't a menace), at level four, I'm at Rouge3 (Phantom)/Warlock1. Current Ability Scores:

Str: 8, Dex: 16, Con: 13, Int: 9, Wis: 15, Cha: 13.

Pretty stinky poodoo for a Rouge/Warlock. I was thinking Subclassing with Hexblade, if I hit Warlock 3, but I don't quite know how to go about the route for fixing this build. 

This is a 5.5e campaign, but seems we can use things such as Xanathar's and Tasha's Cauldron. Any advice appreciated.

Do you have to keep taking warlock levels?

As far as fixing, what is it that you are unhappy with? I know what I would find to be a problem, but it’s more important to know what your issues are.

The main thing you gain with a level of warlock is hex, which requires multiple hits to utilize. You only hit once as a rogue normally. However, a level of rogue also gives you eldritch blast, which doea more hits the higher your overall level. So, if you start off ranged with hex as your bonus action and eldritch blast as your second action, you can do some decent damage without much investment. Then if the enemy gets close you can go back to melee.

Thus, I would say just focus on adding more rogue levels for the sneak attack effect you have gained at level 3. Keep catering your stats towards what you would have done if you stayed rogue. The warlock stuff you gained doesn’t need more as much as the rogue stuff does.

Oh, and as far as your eldritch invocation goes, maybe go with Pact of the Chain? It could be fun to have an invisible imp with you while you are sneaking around as a rogue. Plus it can use the help action without breaking its’ invisibility, letting you get advantage on your one melee attack.

Hey, don’t worry about this too much, ok? I messed up mine worse, and it just comes down to experience. Plus, it’s arguably part of the game to make these kind of decisions in the moment rather than plan everything ahead like I try to do.

Above all else, focus on having fun with it!

Quote from Actionsparda >>

The main thing you gain with a level of warlock is hex, which requires multiple hits to utilize. You only hit once as a rogue normally. However, a level of rogue also gives you eldritch blast, which doea more hits the higher your overall level. So, if you start off ranged with hex as your bonus action and eldritch blast as your second action, you can do some decent damage without much investment. Then if the enemy gets close you can go back to melee.

Thus, I would say just focus on adding more rogue levels for the sneak attack effect you have gained at level 3. Keep catering your stats towards what you would have done if you stayed rogue. The warlock stuff you gained doesn’t need more as much as the rogue stuff does.

Oh, and as far as your eldritch invocation goes, maybe go with Pact of the Chain? It could be fun to have an invisible imp with you while you are sneaking around as a rogue. Plus it can use the help action without breaking its’ invisibility, letting you get advantage on your one melee attack.

Hey, don’t worry about this too much, ok? I messed up mine worse, and it just comes down to experience. Plus, it’s arguably part of the game to make these kind of decisions in the moment rather than plan everything ahead like I try to do.

Above all else, focus on having fun with it!

 Rogues typically have much more interesting things to do with their bonus action than try to get an extra d6.

And his EB will not be great. It will use his cha for to hit, which is low, and EB doesn’t benefit from sneak attack. Much better off sticking with a short bow or hand crossbow or whatever he’s using now for range.

Until the OP answers, we can’t be sure what they want. I mean, I’d say take something like armor of shadows for an invocation so you can go around unarmored. Then take rogue at next level up for the feat, and depending on the goal or direction they want to take with the character, there could be lots of ways to go with it.

Quote from Xalthu >>

Quote from Actionsparda >>

The main thing you gain with a level of warlock is hex, which requires multiple hits to utilize. You only hit once as a rogue normally. However, a level of rogue also gives you eldritch blast, which doea more hits the higher your overall level. So, if you start off ranged with hex as your bonus action and eldritch blast as your second action, you can do some decent damage without much investment. Then if the enemy gets close you can go back to melee.

Thus, I would say just focus on adding more rogue levels for the sneak attack effect you have gained at level 3. Keep catering your stats towards what you would have done if you stayed rogue. The warlock stuff you gained doesn’t need more as much as the rogue stuff does.

Oh, and as far as your eldritch invocation goes, maybe go with Pact of the Chain? It could be fun to have an invisible imp with you while you are sneaking around as a rogue. Plus it can use the help action without breaking its’ invisibility, letting you get advantage on your one melee attack.

Hey, don’t worry about this too much, ok? I messed up mine worse, and it just comes down to experience. Plus, it’s arguably part of the game to make these kind of decisions in the moment rather than plan everything ahead like I try to do.

Above all else, focus on having fun with it!

 Rogues typically have much more interesting things to do with their bonus action than try to get an extra d6.

And his EB will not be great. It will use his cha for to hit, which is low, and EB doesn’t benefit from sneak attack. Much better off sticking with a short bow or hand crossbow or whatever he’s using now for range.

Until the OP answers, we can’t be sure what they want. I mean, I’d say take something like armor of shadows for an invocation so you can go around unarmored. Then take rogue at next level up for the feat, and depending on the goal or direction they want to take with the character, there could be lots of ways to go with it.

You’re right about the first two things. Sorry. I still don’t think Armor of Shadows is worth it though unless he doesn’t have armor already for some reason. Even then, I would probably just take the light armor wince it doesn’t give disadvantage on stealth roles. There’s nothing to concentrate on with eldritch mind. The charisma is too low for Pact of the Blade. Aside from some rituals, Pact of the Tome attack spells have the same problem, so there would just be some extra utility. I still think Pact of the Chain is the best option, but that’s just me.