i am agree to indroduce serum late in game, not from the start, do like x2 for siege reward, and x2 for bastion, people in eu don't like to farm a lot for their pvp gear. if they have to farm for like 6mounth only for endgame gear, and after they have to upp and manastone it they will leave the game as faster as possible becouse there's no reason to farm so much for a gear in a retroserver. people come in retro becouse or they are nostalgic, they want someplace to ranking or just do pvp, so you should do something like resetting gp about every 2-3 mounth, do some arena ranking with reward like serum or double manastane, do a shop in game with battle medal and also ceranium when people is quite full gear with serum or hight level enchant or extend weapon. for incentivate the pvp u shuld do some permanent event pvp with a pvp ranking list, and the first for each class will take gg reward. try to balance the faction and also don't remouve 2x after some time, becouse if some one want to reroll faction or class or also for new player will becoume so hard to set, and also more important things sponsorize more in eu, do a forum in english, is so hard to find information in eu