Hey there, I’m really sorry you’re dealing with that — sounds incredibly frustrating.
Unfortunately, iOS betas can sometimes cause serious instability, including boot issues like what you're seeing. Since the phone is showing charging but won’t turn on, it’s possible the system crashed during installation and now won’t boot.
Here’s what I’d suggest trying:
Force Recovery Mode -Try entering recovery mode by pressing:
Volume Up (quick press)
Volume Down (quick press)
Then hold the Side button until you see a cable icon and a Mac/PC symbol. (Might take 20–30 seconds.)
OR: Connect to Finder/iTunes.
Once in recovery mode, plug into your Mac or PC. You should see an option to Update or Restore.
Use Restore (will erase your data, sadly).
BUT... If that doesn’t work
Try DFU mode — it’s a deeper restore method.
Beta software is always risky, especially on your main device. I’d recommend using a spare device for these early builds if possible in the future.
Hope it helps!