Lost Motivation to Play Anymore.

I'm stuck at character level 273 against the Skull Dragon. There are no more Playo quests, and I have to grind endlessly for gems and orbs by watching annoying ads, plus auto-battling. The critical factor is that leveling up stats with orbs barely makes a difference anymore; the diminishing returns on stat improvements are too significant. It ultimately boils down to infinite auto-battle grinding, and I'm exhausted. I'll move to another game that gives quests.