Fixing crashed MariaDB databases on a cPanel server [closed]

MyISAM has no crash safety. Stop using it for your friends (and enemies) tables.

Remove the setting to revert the default to innodb and use some of the 16G by setting innodb_buffer_pool_size to some reasonable portion of this. Change existing tables with ALTER TABLE {tablename} ENGINE=Innodb and gain some crash safety.

I assume you've let mysqlcheck --repair finish.

On a shared hosting server, its possible your table_open_cache is exhausted, however recommend looking at SHOW GLOBAL STATUS information to identify potential tuning points. With the right information dba stackexchange user can help with tuning and general MariaDB performance.