Sometimes, it just takes one in-between step (or maybe a few) to set you up from complete doubt to a sense of confidence.
It could be a practical, useful, class. Or a light-hearted, well-done, project (which can also serve as a business card). And of course, practice is always great, because you never know when an opportunity comes up to audition or perform.
If you feel like you can’t make a leap of faith, then it helps to find better footing and set up scaffolding so you can walk up more easily.