Also, is there any way to gain like points other than doing quests or talking to that NPC? I'm trying to raise my like with Ste but quests don't give me like points anymore and I'm still only at 50, so I can't take him to bareshade. Is there like a potion that gives you like points?
Each activity has a cap on how night it can raise their affection towards you.
If nothing increases it further for a particular character, then the mechanic for it is not currently implemented in the game.
The game is still very much a WIP, after all.
Characters like Ste are not even Hyao's work, so he's dependent on the characters' owners to provide the interactions to include in the game.