Do the folloing, make a new character, a lala, and try out what fits you most.
Btw your new character too gets all boni your old Character had, so you can even use a Fantasia on this new lala to make another lala.

Before I'd change my old Character, I'd always try it out as a new one first. For the touch and feel how a Lala plays this is enough. (Speaking of Which I will make a Lala now just to squee at its animations in Limsa)