How many interviews before landing a new role?

Had a career change a couple of years ago...now 2 years experience in a high demand field, fully qualified I thought I'd walk into a better paid job.

4 interviews later and been rejected on all 4. Feedback I'm getting is due to a lack of experience on a certain criteria. Feeling a bit disheartened tbh. Just wondering how many interviews on average it takes before finally getting a new role??