Play game. Enjoy game. Be happy.
No enjoy game? Try different way.
Still no enjoy game? Go play with puppy. Be happy.
Win.
Personally I wouldn’t play holy right now but we have a holy paladin in our guild and TBH he does a great job and we clear with little to no problems. Just depends on what kind of healing you want. Druids have great HoT abilities. Paladins get Flash of Light, Holy Light, Holy Shock, and Beacon which is also great.