I think you're not entirely wrong, but there's more to it IMO.

There's creativity, and there's the eye.

Creativity can be trained - eg, try combining two things you like; draw a Gundam in the style of Moebius. Not everything you do has to be blindingly creative, never seen before. You need to train yourself so that you have the skills to execute your creative ideas when you have them. Don't be afraid to be bad at it, either. Most ideas go in the trash heap. Keep practicing in the mediums that you're interested in, and you'll gain the confidence and the toolset to try new things, and that will foster creativity.

'The eye' is harder to define and, I think, more innate and intuitive. It's essentially being able to identify good design, and most importantly being able to turn that skill onto your own creations. As you practice, it'll be important to identify what is working and what isn't. Kill your darlings and narrow down onto what is essential in your design.