I forgot to install sonoma in a partion so now it's installed, I've tried using the migration assistant to revert back, my back up from yesterday has all my stuff but am I stuck with sonoma? Is there a way to revert? I haven't tried using the delete erase all yet but if that's not gonna change my os back to ventura, then it's no point in wasting all that time.
Thank you for any help you can offer me
There's never been a downgrade.
This whether reverting from a beta or reverting from an update or upgrade to a released macOS.
Restore your pre-Sonoma backup.
If you don't have a backup, reverting means you're left to wipe and reload Ventura and start over, or wipe and reload Ventura and pull across just the apps and documents that haven't been modified.
Testing on any computer you need to work, with any data you need available and consistent, and with any Apple ID and its associated iCloud data you need available and consistent... is not recommended.