Reach Out to Apple
If you can’t fix your iPhone yourself, there may be a bigger issue going on. If that’s the case, talking to Apple support might be your best option.
Reach out to Apple and let them know what your problem is. Maybe your iPhone suffered a hardware problem, and the only way to fix it will be to repair a specific part.
Whatever the reason is, they’ll be able to tell you exactly what the problem is and how you can fix it.