I would first contact Apple support and ask them to run remote diagnostics to check the hardware for any issues - and if that checks out and they believe the overheating is due to a degraded battery and iOS 16 or a software issue, I would spend the $80 for a battery replacement and try to get some more life out of it and wait to see what the iPhone 15 or 16 looks like. The 11 is a great phone even today.