Sounds like you've already done everything you'd need to.
Might be worth checking your batteries haven't swollen up (assuming you use LiPo's). If you have any that are near the FPS limit for your site then you may want to make sure the spring hasn't gone stiff and pushed your FPS up (apparently it's a thing but can't say I've ever experienced it myself).
Gas pistols might benefit from a clean and lube for the working parts.
Other than that it's more likely to be kit admin, maybe some dry fire type drills (primary to secondary transition, shoulder transitions, mag changes) if that's your kind of thing.