Text on my website appears beyond the screen on mobile

if yes, how do i create a back up?

Usually website host offer this service, you can contact them for details.

If they don't, you can use a backup plugin:
https://www.wpbeginner.com/plugins/7-best-wordpress-backup-plugins-compared-pros-and-cons/

what about generateblock, classic editor and All in one SEO? do i deactivate these as well

They belong to the "all plugins except GP Premium" group, so yes, deactivate them all.

resolved. My website host was able to remove the code that was breaking my website. I had tried deactivating all the themes including GP but the problem persisted and even continued when I changed the theme

Glad your host did that for you :)