my iphone is stuck on the apple logo

I had recently downloaded a beta version of iOS 16 to test it out. I backed up my phone before loading the beta, and everything was fine! However, I soon noticed bugs in the beta version, which caused my phone to glitch, so I wanted to revert back to iOS 15.5 to fix the problem. After backing up my phone, it's stuck on the Apple logo for two days now. I don't know what to do. If you know what I can do, please let me know. I appreciate your time.