Just checked your advertisement, you have to put more effort into it than that if you want players interested by it.
- The first flaw, is the logo, the shadow looks very ugly, and is just cut-off, while the rest of the logo also looks quite boring.
- The text underneath looks quite messy, some has colors, some bold, some with different fonts, generally not very organized.
- You say there's no refunds, but the server name contains [Refunding] in the picture of the TAB list you provided.
So generally, the layout of your advertisement and the pictures looks messy and very unproffesional.
But posting advertisements isn't the only way to get a good playerbase, maintaining a playerbase might be hard, but it will attract other people to your server, the more people are there.
If you have enough unique and good features, systems, economy and such, players will eventually join.
Mostly depending on how you catch their sight from the beginning when they join, or of your features, they'll stay, and play.