What's the best way to downgrade from Sonoma to Ventura?

I upgraded my desktop from Ventura to Sonoma, figured out how to re-enable WiFi, but bluetooth just doesn't work. The WiFi speed is slow. I feel Ventura support is better (OpenIntelWireless hasn't released Sonoma supported driver yet) and want to rollback. Although I have Time Machine backup, it says I need to reinstall. Is this the only way?

On Windows, one can downgrade from 11 to 10 if the previous installation hasn't been cleaned up yet...

submitted by /u/yagers
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