5e Potions
https://www.nexusmods.com/baldursgate3/mods/369

5e Spells
https://www.nexusmods.com/baldursgate3/mods/125

Feats Extra FullGameReady
https://www.nexusmods.com/baldursgate3/mods/167

Zerd's Rules As Written (RAW)
https://www.nexusmods.com/baldursgate3/mods/1329

There was another feats mod but the author took it down so I removed it.

In addition to the Cleric mod in my previous post:

Bard Fixes and Tweaks
https://www.nexusmods.com/baldursgate3/mods/866?tab=description

Sorcerer Progression as in PHB
https://www.nexusmods.com/baldursgate3/mods/1574

I use this but I've not got anywhere near level 12 yet so I don't know how it will go at the higher levels. There's also a patch for it to work with the 5e Spells mod.
UnlockLevelCurve - Level 13-20
https://www.nexusmods.com/baldursgate3/mods/377

The rest of my mods are mostly QoL plus a couple of cosmetic.

I don't play multiplayer so I can't offer any help there.

Duh! Just realised that Recruit Any NPC actually states "Make Full Custom Character Party" in the title.