A build battle gamemode is a good way to attract more people - especially builders - to the server. A simple 8 Player (FFA), Duels and 2v2v2v2 gamemodes should do, with a time of 15 Minutes and a random theme, this will be fun!
Now, for the paid aspect of it - Make players with a rank able to choose themes. (If they don't vote, the theme will be picked randomly, Unlike some servers that let people vote without a rank) Also make them able to vote for more (20 Minutes) Or less (10 minutes) Time to build.
Also, the events. Maybe host a tournament like event, where the winner gets their build placed within the Build battle mini hub.
