Solved

Inactive league host

In my league is inactive host for 15 days. I'm in this league for 30+ races straight, but for some reason I can't click on the button to become host. Do you have some explanation or help please.

You changed tiers (promotion to Pro) and this resets the counter. To become host you need 20 races in one tier, unfortunately.

Maybe that was on purpose to help make sure someone at a high level would own the league

That really sucks, but anyway thank you so much for answer.