Mycology

It'll be difficult finding an 'official' treatment, as research was blocked for the longest time and has just started up again. However there are various legal ways.

There are groups and tribes that provide treatment or rituals. For example ayahuasca rituals are available in Latin America, and I remember reading about a treatment in Mexico.

Alternatively you could do it yourself, you could visit a place where it is legal like in the Netherlands, where you have smart shops. For the love of all that is holy don't take it in a hotel room or in the middle of the city, or at a party.

You can't buy them off the street because there is no profit in it. It's sort of like an anti drug because you won't feel like taking more, and it'll likely take you off other drugs.

Your best bet might be to DIY. You can order spores online, which afaik is legal in most places, but look it up to be sure in your jurisdiction. There are plenty of websites describing how to grow them. It's a slightly involved process but it's doable and a batch will last you forever.

I can't overstate enough that you have to respect it. Look up online how to use it properly. Don't take it if you have schizophrenia or suspect you might have it.

Consider what dose you'd like to take, you can start small. You'll need a trip sitter you trust, like a good friend, and you'll need to be in a place where you feel safe and won't be bothered by people. The best setting is typically nature. Eat healthy before. Not too late in the day. You'll need rest the next day.

What will be troubling is that it tries to yank you out of your normal way of wanting to experience things. Your initial reaction will be to fight it, but it'll just keep yanking until you let go. That can be quite uncomfortable if you're being stubborn. It's important to remember that this is a natural part of the process and nothing to worry about, and in fact desirable and what makes it effective. All you have to do is let go and accept it. Essentially it'll force you to listen to your feelings and exist in the moment.

So as you can see it is rather involved. However, if you have chronic depression or feel really stuck I can personally recommend it. It's impossible to describe but perhaps you can compare it to going on a walk with a good friend and having a really insightful talk.

Alternatively I can recommend meditation. In my experience it is more powerful and accessible. Even though it is simple, it requires practice. If you don't know where to start you can find lots of material including apps, books, websites, videos, and even a series on Netflix. Maybe a good start might be watching a movie such as Baraka or Samsara.