What will happen if I reset my settings and content?

To remove the beta, see here: How to uninstall iOS beta software - Apple Support

That is as much help as you are going to get here, since its considered confidential and currently only available to developers and special invitees. You should not even have it if you are not in one of those groups.

It will wipe the phone to factory state.. so if you have data/photos etc that you want to save. You need to do a backup first

https://support.apple.com/guide/iphone/back-up-iphone-iph3ecf67d29/ios

We can't discuss beta software in these pages.