As a person who doesn't believe in constellations and tarot cards, how can I communicate with them?

You don't believe in constellations or tarot cards.

As the saying goes, if you believe, there will be, if you don't believe, there will be.

Since you don't believe it. Then you can't communicate with them. You have always been skeptical and negative because of their views.

I suggest you try to learn about constellations and tarot knowledge. It is best to try to communicate with them after you have a certain understanding of these two items.