Competitive games in general, really. I just don't enjoy the process of learning, training and competing in them enough.

I don't think I'll ever play Touhou games on Lunatic difficulty. Not that it's outright impossible but it's too much of a time/motivation sink to learn the patterns and stages all over again and I think I'm pretty content having beat them on Normal difficulty.

The velvet attendants in Persona 3/4/5. I'm sure I could beat them given the opportunity, but the fact that they're locked to NG+ means I prolly won't ever get there.

Jump rope minigame in FFIX same. I competed in it for an EoFF tournament once and that was the most I ever played of it, and I'd rather not play it again in lifetime. At least it knows better than to lock any ultimate weapon components behind getting 1000 jumps *cough*