I believe you can build several products around that niche and sell, like ebooks, accountability programs, coaching etc and use the psychological aspect as the axis around which you create the content to promote those products... so may be a blog which consistently educates and inspires on such topics but also has some info products and coaching etc for those who need more support. Otherwise building a membership site only on the content is a bit tough now a days because some super good quality content is available on almost any topic for free or almost free.

On that note, I used to blog on somewhat related topic almost daily and have not done so for over a year and still get a few sales every week on the book I have on that blog. If you'd like to chat more about how I built it and market it on a shoestring budget, I'd be happy to help.