Adobe Elements für Big Sur

>>>but unfortunately Elements no longer works.

Which version? Elements 2021 is the only version which officially supports Big Sur.

https://helpx.adobe.com/photoshop-elements/kb/macos-big-sur-compatibility.html

You should always wait to update your Mac operating system until you verify that the non-Apple programs you use are going to work properly... not only Adobe programs, the 2nd link below is about Avid... aimed at video editing, but it is a warning for ALL non-Apple program users
https://community.adobe.com/t5/download-install/can-i-run-my-adobe-applications-in-macos-11-big-sur/td-p/11586901?page=1
https://ymcinema.com/2020/11/15/premiere-pro-and-avid-editors-do-not-upgrade-to-macos-big-sur-yet/
https://tidbits.com/2020/11/13/big-sur-is-here-but-we-suggest-you-say-no-sir-for-now/

I do NOT know if these links will work with sur
https://macpaw.com/how-to/downgrade-from-catalina or
https://www.macworld.co.uk/how-to/mac-software/downgrade-macos-3581872/