There was a quote but it turned out to be too long...

I would say "Go level a Scholar!" but you've already progressed so far as a White Mage it would be a shame to give up (Definitely level a Scholar though because they are awesome!). Also think of the poor NPC's they'll be expecting this awesome White Mage (you) to show up to help them and then "What?! you're a Scholar now?" <-- I digress.

Keeping Regen ticking on the Tank and anyone who takes damage is a really good way to get some breathing room as you can relax and reassess the group and see how everyone is doing for 3 seconds or so while you wait for GBC.

Also if everyone is topped up on HP don't be afraid to re-apply Stoneskin on the tank + others if you have time! 18% of max tank HP is 1-2 attacks you don't need to heal

I think it's sweet that you care so much ^.^

Now go be the best White Mage you can be, if that fails go play a Bard like everyone else x