Just opening the conversation into how to get a bigger playerbase. Below im going to list some ideas of how please add to the suggestions and if you could do any of these i belive the owners will be greatefull.
Linking to friends and comunities (Discord groups / reddit etc...)
Spamming other servers (Against the rules but if u belive this server is worth it xD)
Getting icons (minecraft youtubers / streamers) to advertise the ip
Posting on minecraft server pages (if there is an offical one for that website try and link it)