Since you already went Priest 3, I would recommend you go:
Cleric 1 - > Priest 3 -> Monk 1 -> Cleric 2 -> Monk 2
Monk 3 only really gives you base damage on skills and higher Energy Blast charge up, as Golden Bell Shield is really bad right now.
Cleric 2 is very powerful support wise. Heal 10 and Safety Zone 10 + Attribute (40 blocks total) are amazing. People say Cleric 2 is mandatory for good reason.
With Cleric 2 -> Priest 3 as a base, I’d say you’re 80% as effective as a full support C2/P3/X/PD build in the support role, while dealing plenty more dps with Monk 2.
In fact, I’d say any Cleric 2 -> Priest 3 build is viable end game. It doesn’t matter what the last two classes you pick are or what your stats are, the combination is that powerful.
Edit: Cleric 2 -> Dievdirby 3 is also very good for anyone reading.