I think that depend on what you mean by "safe place." If you mean somewhere you can ask questions about it, I think any of the esoteric subreddits would be a good place to start. If you mean somewhere that a lot of people will agree with you, then I'm not sure of a good place.

No offense is meant, but I think you'll only be able to seriously engage on that idea in a group that avoids mainstream science. I say that because accepted scientific evidence goes back hundreds of years.

Arguing against a heliocentric solar system is arguing against roughly 700 years of scientific thought. That doesn't mean it's wrong of you to try, but there is a lot of evidence that the Earth and the planets in our solar system orbit the Sun. So to find a like-minded group, you have to find other people who are willing to disregard that evidence.

I myself would be willing to discuss it, but I do admit that it'd take a large amount of evidence to change my mind, simply because a large amount of evidence is what got me to believe what I currently believe.