How can i get more users?

The only way to get more players on your server for free is through the name of the server, the gamemode and the amount of players on the server. Nobody wants to join an empty server so you really need players to get players. Try getting at least 10 of your friends (if you have any) to play at the same time. This will probably kickstart your servers growth. Also, make sure to have a decent Discord server that's easy to find to retain the players you already have and to really create a sense of community.