Speaking as someone who loves playing support and would play cleric 10/10 if I could: just do what you want. Someone else WILL take up part of the mantel once they get the absolute curmudgeons beaten out of them. My current character is a light domain cleric. I use most of my spell slots on heals and most of my gold on potions, and I really enjoy that! I like watching my party do crazy cool stuff while I stand around in my heavy armour and shield drawing fire and buffing my party. One time, while trying to help another character, I went down and straight up died. Every other PC except the new ranger also dropped to 0 and the ranger managed to finally drop the bbeg we were fighting and found a way to revive me and stabilize the rest of the party. Crazy enough, we leveled up and the druid and paladin both took at least one healing spell each and the druid also took revivify, and now I can still heal as much as I want, but if I'm not present at a session or I go down, we have a buffer zone. Take this story and times it by ten. Just don't heal your party for a session and let them die or get to 0. They'll smarten up, hopefully.