21st Level Cleric Advice Please

[Tollak Vargsson]

I'm playing in a 2 year long home brew campaign that's lasted a few levels longer than originally intended.

One player took a Slayer dip so they haven't reached 20th level which is why I think we're still advancing.

We leveled recently to 21. I HATE the rules for advancing past level 20 but I can't really think of what to take instead of another level of Cleric.

The character is a NG Cleric of Tamara (D&D dragon God of healing and mercy) who is a complete healing/Perception build. Good/Sun/Healing domains (DM let me take a domain as a feat), 32 Wiscom. 18 Cha. Only weapons are a scimitar (has never been unsheathed since 1st level) and a +1 Light Crossbow that's been fired less than a dozen times.

If I'm not tossing out buffs, I'm channelling or healing. The last few levels I've finally started taking damaging spells but I'm not overly optimized for it, nor is it really something I'm too interested in with this character.

I'm looking for something that would provide the most benefit with very few levels as I don't think we'll get more than a couple more.

Rest of the party is a Witch, Inquisitor, Magus, a Paladin/Slayer and a Bard who's there about half the time.

[Vatras]

If not advancing in the primary class, the best options for MC are martial types.
Then there are prestige classes: holy vindicator, pathfinder savant, and those in the adventure paths for certain deities, which could be used as templates for your deity.

[SmiloDan]

Warpriest or Oracle?

A Life Oracle and some Extra Revelation feats can boost a healing cleric, give you some extra low-level channels for mopping up healing, and give you some extra skill points. Your Charisma is high enough to make it worthwhile, and you can probably invest in a +6 item and +4 book to boost it further.

A Warpriest can give you Blessings.

A Bard or Swashbuckler can make use of that Charisma and help with Reflex Saves.