You’ve probably tried this but in case you haven’t: try putting isopropyl alcohol in the gaps around the bumpers, it can clean the contacts and make the bumpers work again.
But yeah I’ve also has a ton of first party xbox controllers fail on me, although usually its the left stick or right trigger (I mostly play rocket league which abuses both) and was mostly the xbox one controllers so I’ve switched to more durable 3rd party controllers.