Ask HN: Courses/resources to improve my self-esteem and believe in myself more?

I've been well aware I suffer from low self-esteem for many years and have worked with a therapist to try and address this but it's obvious I've got as far as I can go with my current therapist. Before I just change therapists I'm looking for empirical evidence from HN readers that might have gone a different route that has yielded tangible (if personal) results. Does anyone have anything to recommend?