Replace the battery or pay to have it replaced.

iFixit sells good quality aftermarket batteries if you want to do it yourself (which I do recommend)

It’s impossible

I just didn’t get used to it, lol. Switched from iPhone 7 to 12 pro to se2 back to the same 12 pro and then to se3. The gestures all became muscle memory but having a notch and face ID instead of touch ID still sucked

How long will it last? I see it getting security updates for at least 8 more years (ten minus how long it’s been out) – the hardware can last far longer than that if you take good care of your phone.

1. Try a different charging cable
2. Try a different power block
3. Try a different wall outlet
4. Buy a new battery and replace it if none of those things worked