You should have a Skyblock mode where you have your own island and you can expand it. You can also buy things from a command called /shop. You can also invite your friends to join your island. You can also sell things to the /shop. If you have a Rank you get more stuff. You can also get kits daily, weekly or monthly. It is a pretty awesome game mode to play.
that sounds a lot like another server’s skyblock lol
also that idea sounds pretty p2w
I agree with Teal, while a skyblock server may or may not be nice, it should at least be unique and not a ripoff of another server. Aside from that you would also have to account for popularity, maintenance of the server etc… I can imagine servers can be quite expensive