First Your rates are not really good i think on hight lvls
so try to highter up to like 150x or something { easly done }
second you need to find a good host
so no D/c For players { Semi Hard i think }
third make the server on 24/7 { easy if u have a restarter }
forth make nx event every day but only 10 peoples chosen each day and the gm whisper to them to come to a place and he summons some nx slimes
{ semi hard since that i heared the nx slimes D/c the server }
fifth all 1st 2nd 3rd 4th job skills work without any d/ces
i think those will be pretty cool for the server