Nice thing about 5e is that a dedicated healer isn't as necessary as it was in previous editions. Any character with Healing Word (a bonus action spell that heals a small amount of HP, which is still enough to get an unconscious character back on their feet) can handle in-combat healing, and out of combat characters can spend hit dice to recover lost hit points on a short rest. So long as bonus actions and short rests are a thing your party composition is more open already.
