Well make custom armor and custom weapons! Make something different not something same like all other servers out there...! I mean i dont have seen a server Epilogue with custom armors or weapons...and when i mean custom i dont mean those epic armor dark knight ice armors flaming armor and those kid armors with the million status...You can thing of adding the vesper armor as your custom armor with custom status and you can different armor for different classes i mean light vesper armor that gives accuracy, patk, atk spd but a dagger cant wear it...or a heavy armor that gives HP p def patk but a archer and a dagger cant wear it...its easy to make it like this in epilogue files.Also custom weapons maybe you add the normal vesper weapons but as custom you will can exchange the vesper weapon and some of farm items for a another custom vesper weapon with 2 SA on it. Also a good server will be nice to have clan event as i read above is a good idea!:) TvT event party events and so on this will make players more action! Also a thing you should take care of it is the farm dont make the farm easy what i mean? I have joined the last years in more than 15-25 epilogue servers all of them was the same in the end and all of them has the same farm style...when you get good geared (very easy you just can buy the vesper with adenas) then you have to farm for about 5-10 min to get a blessed and start enchanting...this sucks the players will boring! Add Raid Boss that gives items Much Blessed scrolls WEAPONS/ARMOR clan items life stones and too much usefull things that you will can farm in game but hard so with the raids will be more easy! Also dont make the raid boss a killer! add 2 types of raid boss The Grand Raid bosses which is Valakas Antharas Zaken etc..and Add Normal raid boss like Ketra raid bosses Varka raid bosses TOI and so on...and make the Grand Boss hard to kill and the normal easy...but i dont mean 1 sph can kill it alone with +0 gear....
Just thing only about the gameplay of your server and thing a way that players will never get boring!
This is my idea and sorry for bad english:D!