Prohibited sigh MAC

So I’ll keep it simple this is my fourth time breaking MAC OS others were completely my fault.

I was doing some computer science work, when I had to reinstall some python and pip. I run into some issues when I saw that my terminal was running 2.7 version and didn’t really work with my project. So I found this command that helped me delete python with terminal ad I couldn’t find it with my application folder. So I run it my screen froze and then I got a prohibited sign every time I logged in. I run cmd + r to see disk utility. Machintoch was un mounted, I mounted it and realized that it said filled with 20/200gb literally had 150/200gb. So now I didn’t do anything else to make it worse. Is there a way I can restore everything?

I’ll add command if you need to see it. Sorry for my English it’s my second language