[Mashiro]

Huh. That is a weird question. After you have freed up space you can most likely start the MariaDB database server normally.

Try it.

By the way: I never spoke about removing everything that used up the space. I was merely speaking about making some free space. If all the files you had were in use / important then of course you have nothing you can move/delete to free up the space if the files are needed for your hosted applications. Things like deleting logs and such can free up a bit of space. That might be enough to start the database server but it will not operate for long because logs will fill up quickly again and the databases also grow when in use.