Hello! I have a huge problem. This is almost the third day and the game is still bricked for me maybe because I tried the weekly challenge.😰 How do I contact niantic about this if the game doesn’t even open?

Whenever I click on the app nothing happens, no black screen, no waiting screen, nothing.

I uninstalled and reinstalled it, nothing again

I don't know what to do, it was all fine 3 days ago and I did nothing wrong, I just tried the weekly challenge