Thinking about doing another run with a single class party. My first thought is druid, because between the subclasses you can get a good mix of healing, AoE, and tanking. What other classes might work? Is there enough gear to go around for this to work?
I did college of swords with dual hand crossbows and short swords. I also took 3 levels of rogue to get the second bonus action (for 4 attacks per round). Spell slots mostly went to utility stuff.
Valor is your tank. Strap on a shield and take some defensive spells.
Lore is your main caster. Mostly debuffs but you can pick up some variety with magical secrets.
For a full bard party, I'd probably take 2 lore bards for the spell variety and either take a dip into warlock or sorcerer or pick up Spell Sniper with at least one of them for access to better cantrips.
Doubling up on swords is also a good option since your bardic inspiration recharges on short rest (starting at level 5) and you'll have 6 short rests per day thanks to Song of Rest.