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?
Bards vary wildly depending on build and subclass, so there isn’t really a right way to play one. But they are neck and neck with Wizard for strongest class in 5e.
Lore is a traditional full caster with expertise and access to spells like Spirit Guardians, Aura of Vitality (its called something else in game but functions the same), and Fireball that he really shouldn’t be able to use, but Magical Secrets are awesome. Build as a Blaster or Healer, with particular attention paid to Paladin and Ranger spells as these give the most bang for their buck per spell slot. 1 lvl of Life Cleric makes Lore Bard the strongest healer in the game by a country mile.
Sword is a Gish, with full Martial and full Caster capabilities. Ranged Slashing Flourish basically doubles the number of times you can attack per round. Only pure Fighter is a better ranged Martial and only in prolonged fights.
Valor is more of a Support/Tank, but they also gain access to a wider range of weapons than Sword so they can provide some odd but powerful equipment combos for debuffing enemies or buffing allies, but for the most part you would be better off with Sword.