Ranking and visit losts due to migration

Dear all,
I migrated my website from YOAST to SEOPress 1 month ago and I noticed a loss in google ranking as well as less daily visits.

Another issue that I have is that the Home of my website is not showing on google as the first result when someone looks for my company, but actually the legal imprint page shows, which is of course not relevant.

I don’t know how to fix this but something in the SEOPress configuration might be wrong due to the import data from YOAST which is causing this issue, I highly depend on my website as main income and I really appreciate your support on this one!
Thank you in advance.
Federico