RDM and DNC are really easy. I recommend going with RDM due to your condition, because it's not proc based like DNC.
As a Dancer you have to react to procs a lot, always adapting your rotation to them, paying attention to it and picking the right skill to use based on the situation (aoe vs single target).

As a Red Mage, you just spam the same simple rotation. However, this rotation is going to get much faster in Endwalker, you'll be switching to close combat rotation twice as often.