Rescue Plesk Obsidian Webserver

I broke my Plesk Obsidian webserver while trying to update MariaDB, and all sites are now offline. I need an experienced freelancer to diagnose the issue, restore server functionality, and get the websites back online as quickly as possible. Please share relevant experience with Plesk, MariaDB, and server recovery work. Challenge phrase is dingus. The goal is to identify what went wrong, fix the problem, and ensure the server is stable and operational again. The most important bit is the data: we must not lose any emails, sites, etc. Starting over is not an option. You'll get ssh access to the server. It's Ubuntu Bionic