The general rule is that the features don't really matter, it's the advertisement and especially name that counts. If you want people, try to buy out some dead project with decent followers on social media (and preferably a long user mail list) and build on that. The thing is, it's very hard to impress L2 players these days. Things like "non-influental donations" and "supported even with less than 100 online" were burned out already because it's a phrase that virtually every server owner promises. If you want to catch players' attention, it needs to be something jaw-dropping.
Also if there's anything that I'd consider as for having a potential, is a server based on Classic chronicle. If you want a midrate, fine, but make it a Classic. Even a basic Java Classic will attract MUCH more people than a perfect H5/Interlude files. The thing with Classic chronicle is that combines best of both worlds - the oldschool content of C6 and functionality of H5, just both better. People who try Classic usually don't come back to the older chronicles. Sure there're still some people who play them, but their community is shrinking as more and more people try the Classic.