Melees problem is usually that they run far away from the healing range so it is usually impossible keep them alive. Some ppl think killing healers is always the first thing what 2 do and then healers kite those melees behind until they can not get any heals anymore. Melee should always stay in healing range. If opponent is running away, you should change 2 another target and if many players target on you, you should run back 2 your group with sprint. Also personal limit break should probably get 25% damage nerf or something like that because you can do it so many times in the battle.