Stop making raids so range heavy and anti-melee, everything is a one shot from the bosses. Allow the players to play their way and melee or do whatever. They could make raids where bosses have phases, and them one shots come, and phases where adds come out still, but when out of the phases the boss is stuck with tank and only the tank as long as the tank is doing hes job. This opening up for melee to be possible. Half the time the boss fights are more about luck than skill , this shouldnt happen ever. Stop forcing players to be ranged. Boss Fights like this you would just increase the amount of health for the bosses , and actually made the phases have tactics to make, not just "burn boss and hope we dont get one shotted". This alone would make PvE more fun.