You can easily grow mushrooms that contain psilocybin at home. It's an easy process, the internet has plenty of communities.
If you are not very experienced with psychedelics, please inform yourself about best practices / harm reduction. Look into set and setting. Have people around who you trust.
For most people, psychedelics are not a substitute for therapy. The healing happens in between trips, but you have to put in the work - don't skip integration. The average Joe will need professional help for that.
If you have serious issues or if you are repressing a lot of stuff, it will most likely come up during a trip and you will have to process it - psychedelics show you what you need, not what you want. That being said, most people that have a lot of experience with psychedelics will tell you even difficult trips will lead to positive gains.
Overall, it's mostly a marvelous and wonderful experience that can be life changing, but please treat it with the respect it deserves.
This is not the only study that points to lasting relief from depression. Your experience is valid, but also anecdotal and not necessarily representative at large.