Probably better suggestions above me than the one I'm going to suggest, but personally, I'd give serious thought to a thief rogue with the healer feat. You can heal 1d6+12 to each party member per short rest (that's an average of 46.5 hit points per short rest assuming nobody is at or near max). Rogues can do melee or ranged pretty effectively. They also have thieves' tools and lots of skills (expertise in 4 by then) to lean on. They are pretty SAD, so you can pump some Con to not be so squishy (and a well-timed uncanny dodge helps there too).

Just a thought. Artificer, druid and wizard also look like great fun. Let us know when we find out what the others are playing and what your rolled scores are.