No worries, I think I might feel sort of similarly about Pietro. Wanda aside, he's pretty much out of things, but he's not...not an instigator? So I don't know that I can really help you, unless you want to brainstorm some kind of plot we could throw both of them at and see what happens?
Off the top of my head, maybe some student has some kind of power-associated (and outside power-resistant) medical issue, and Pietro gets called in to mimic their power in an attempt to figure out what's going on, because he can turn it off and recover after using the power but the student just keeps getting progressively worse, so they need to figure it out? I don't know how much sense that makes...