Just some opinions of mine to take in to consideration of what you-Koolio- and the whole server can do to improve.
1. More Support!. There is only 1 active support, and that is Ytsen. I think you should consider getting another Support, preferably one from the U.S(Nothing personal, just the time-zones). Plus there is a few active staff right now so I think staff should be fine in numbers.
2. To players- Be nice! A good first impression is key. More people will stay due to a warm welcome- proven fact.
3. Koolio- to follow up- more support would also be nice to help with W/E and town blocks and all those things. And most of the time you are AFK doing some things so it would really help alot.
4. I know you were thinking about this Koolio, but to make the server premium. I think all the dedicatedplayers on KZ currently have premium, but we will have to talk about that I guess. New perks with premium include, better server advertising, and no fake accounts, it seems people with premium tend to be more serious, which is great. And, more sites to vote on i think and a few other perks too.
5.Maybe give staff more perms? Idk what though, but just a random thought.
6. A mini-game world? Games like Minez or something. You can put SG, Skyblock, Warhub, all in this little world area so it would be easier to access and play the game of your choosing.
Please leave your ideas down in the comments. I kinda had writers block and couldnt think of what KZ needs. But anyways, i hope you give these thoughts into consideration and talk about them.