Start trying to turn it into self supremacy, or at least body supremacy and mindshifting.

Same but I try to turn myself into mythical creatures to see if I can replicate there abilities

Do everything I can with it.

I would shift my body into different custom forms everyday like they were my outfits of the day. I would also experiment with my power and see what exactly could I turn into and what my limits are. Like can I turn into non-human creatures? Could I turn into objects and not just living things? Could I mimic other powers? Etc.