how can i go back to ios from a beta update

If you are currently on the iOS beta (13.1) Then visit this site for details on how to delete the profile and then wait for iOS 13.1 to be released in three or four days. You will then be able to update to the normal iOS.

How to uninstall iOS beta software - Apple Support

I would strongly recommend you just leave things be, wait until September 24th when they release 13.1 to the public and update to that. Then remove your beta profile.

can i go back to my old before updatedMac.

thanks