Please help, MySQL server is on other server.

[04:46:43 WARN]: [Craft Scheduler Thread - 319] WARN com.zaxxer.hikari.pool.PoolBase - luckperms - Failed to validate connection org.mariadb.jdbc.MariaDbConnection@2315fcb1 (Connection.setNetworkTimeout cannot be called on a closed connection)

You can try using the MySQL driver instead of MariaDB.

The last packet successfully received from the server was 60,112 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.)
[12:09:16] [Craft Scheduler Thread - 30/WARN]: [Craft Scheduler Thread - 30] WARN com.zaxxer.hikari.pool.PoolBase - luckperms - Failed to validate connection com.mysql.jdbc.JDBC4Connection@691f7ad7 (Communications link failure

Your MySQL server is timing out connections for whatever reason.

There's a list of things you can try here.

https://github.com/lucko/LuckPerms/wiki/FAQ#luckperms-cannot-connect-to-my-mysql-server