Car Got Boxed in on A Steep Hill

I parked on a rather steep side street, away from all other cars. An hour later, I return and there are two cars that are too close for comfort, despite their being ample room along the street, and unfortunately since the hill was so steep my car kept sliding forward when I took it out of park, and I couldn't reverse it enough to really get out. I went around to all of the businesses and nobody knew who's cars they were, and naturally as I was waiting outside, a thunderstorm started.

Thankfully a very kind man came and asked if I was alright, and after a couple of "You're good, you're good STOP!!!" we were able to get it out, but I'm trying so hard not to still be super pissed.