If you're good at picking things up in a hurry, the best way to gain experience in new skills is to get hired for your existing skill set, either at a very small company or (better yet) a large one with incompetent management.

In a small company, everyone wears a bunch of different hats and you will often be asked to do new things outside your official role.

In a large company with bad management, staff turnover will ensure that they regularly find themselves short on skills, at which point you can stick your hand up to pick up the slack.

Either way, if you consistently deliver the goods then they'll keep coming to you with new challenges.