Are you looking for in-combat healing or out-of-combat healing?
A 1 level dip won't bring a noticeable amount of that to a 9th level party. But if you're mostly looking at standing up people who have dropped unconscious then a bonus action to get them up instead of a full action with your lay-on-hands has some value. If you're just looking for more ablative HPs for a battle then the Inspiring Leader feat will bring you a lot more damage soak per day then your healing will bring (but doesn't have the stand-up-fallen aspect). I mention that as "in-combat" because it's a buff you will do before they enter.
If you're looking for out-of-combat healing, paladin is still pretty good with aura of vitality. Or go divine soul sorcerer - CHR as casting attribute, pick up bonus action healing spells, and at level 2 you can get Extend metamagic which makes your Aura of Vitality twice as potent per casting. No free 3 HPs for a 1st level healing spell, but at 9th I don't think that's really noticeable. Inspiring Leader helps for out-of-combat healing as well, because you have less wounds to heal.
