My Bluetooth and WiFi won’t turn on

To rule out a software issue, reset your iPhone to factory settings on your computer, which will download and install a completely new version of the latest iOS.

Set up your iPhone "as a new device", without using the latest backup, and test if you can enable Wi-Fi and Bluetooth.

If it works again, use the backup to restore your data.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Wouldn’t this restart my whole phone and my data

If you created a backup before resetting it to factory settings, you can still get your data and settings back by restoring form that backup.

My Bluetooth and Wi-Fi not showing up