Of course.
Would rather not revert, 10.5.3 was incredibly buggy for me.
Any way to retrieve all the settings?
What I will be doing after making my final SuperDuper! backup of both of my Macs currently running OS 10.15.3 is to do a clean, fresh installation of OS 10.15.4, then do a migration/copying of needed files, folders, settings, apps, etc. That has always worked for me.
Usually, I would just apply the OS 10.15.4 Combo Update, without doing such a migration. But, given it has been quite a while since OS 10.15.3 has been released, and with all the issues I am seeing folks have with just updating to OS 10.15.4, I am definitely going to do a clean, fresh installation.
OS 10.15.3 has not been buggy for me, but of course I make a concerted effort to keep both of my Macs "lean, mean, and clean".