Help on multiclassing Glamour Bard

I am working on a Glamour Bard, and I am contemplating multiclassing before level 14.  

1)  The level 14 ability works on only the first attack so if facing a creature with multi-attack or more than 1 creature with multi-attack this will have less effect. (Anyone have helpful information on this subclass feature?

2)  Is superior Inspiration and Word of creation worth staying BARD.

3)  Many higher-level spells worth staying Bard for

4) Contemplating Sorcerer for Meta-Magic Or warlock (Arch Fey to fit Glamour/charming)

Any suggestions?

What do you recommend for level progression

I was thinking 1-12 Bard then 13-18 Warlock then 19-20 Bard.  But that will leaved Unbreakable Majesty for level 20 - Or 1-14 Bard then 15-20 Warlock (Focus feats to get CHA to 20 then other stats or flavor feats.

Quote from Marc_Ducorsky >>

What do you recommend for level progression

I was thinking 1-12 Bard then 13-18 Warlock then 19-20 Bard.  But that will leaved Unbreakable Majesty for level 20 - Or 1-14 Bard then 15-20 Warlock (Focus feats to get CHA to 20 then other stats or flavor feats.

 I would go straight to Bard 14. That will let you get all the spells you want from Magical Secrets (remember you can retrain a spell into other class spells each time you level) and get Unbreakable Majesty. After that, I would take Warlock the rest of the way.

How is this?

Riff Strumman's Character Sheet - D&D Beyond

Quote from wagnarokkr >>

Quote from Sequilonis >>

Quote from Marc_Ducorsky >>

What do you recommend for level progression

I was thinking 1-12 Bard then 13-18 Warlock then 19-20 Bard.  But that will leaved Unbreakable Majesty for level 20 - Or 1-14 Bard then 15-20 Warlock (Focus feats to get CHA to 20 then other stats or flavor feats.

 I would go straight to Bard 14. That will let you get all the spells you want from Magical Secrets (remember you can retrain a spell into other class spells each time you level) and get Unbreakable Majesty. After that, I would take Warlock the rest of the way.

Seconded.

If you start at low levels and painstaking play week after week and climb to Level 20, you are paying a lot of points for the 1st couple of Warlock levels. If you are starting out with a high level, then I agree with the above.  If you start at 1st level and work your way up, you might want to grab a warlock level or 2 early when level advancement is low points.    

The other thing is how do you justify/explain etc. in game how you came to be a Warlock?   Not so much from the Character's POV but from the Patron's POV.  Why would a Patron make a deal with your character?  You now have in game experience so what happened in those previous game nights that warrant the Patron's attention?  This would be a nice opportunity to have the DM incorporate the Patron (or minions) into the game long before you incorporate the warlock level.  Of course this flows right into the above advice to get 14 levels of Bard 1st.

You should only multi-class if you're looking for something specific.  

Not sure if you took War Caster or something like it, but a tip i found online recommends utilizing the Eldritch Mind since abilities like your Bard’s Mantle of Majesty require concentration.