can be this:
[Mon Apr 18 16:20:36.151476 2022] [core:alert] [pid 1533238:tid 139954185135872] [client] /home/regen/domains/regenerativehealth.ie/private_html/wp-content/uploads/.htaccess: Option ExecCGI not allowed here, referer: https://regenerativehealth.ie/
commented out the line Option ExecCGI in private_html/wp-content/uploads/.htaccess
-not sure how that got added to .htaccess, prob was there by default after moving to the new server.
Found logs in user account > system info & Files > site summary/statistics/loss
usage log and error log is in there.