Add a quest system: This would make GTM more interesting since the only thing new players work for is money to rank up but once you reach godfather, there isn’t much to do. You just go around killing players and it’s basicly the same routine everyday. If a quest system is added, it might keep the players’ interest and as a result it could increase the player base and give newer players a better chance to grow stronger.
I personally don't think this will be a good fit for the GTM server, GTM is all about PvPing and becoming the best. I don't know what a quest system has to do with that.
Just because it’s a pvp sever means there shouldn’t be quests? Many other Minecraft servers and other games have quests for pvp game modes.. A quest system could also help you become the best, you can show off by being the person who completes the most quests or get rich from rewards.
It could be a thing, but i personally think we should put our focus on bug fixes and the udates that are already planned in. Maybe for the future this could be a thing, if you make it on a correct way.