Leveling for tanks and healers
One thing that has always been difficult in mmorpgs is leveling as a healer or as a tank. Because of their low damage output. I don't really now of a solution for this but I think as a community we could think of one. Also finding groups to level with is easy for some people but for others is hard. After all, a lot of us have trouble asking others for help even in games. So maybe implement a system that allows to group up with parties to level up or think of a way to solve the low damage output of tanks and healers. Making their damage higher might not be the best solution because that's the role of dps characters after all. Also we need to find a way to make the tank and healer classes more popular because in most of the games an extremely small amount of people plays them.