Where can I see my account status, and how many hits I have left?

Upon logging in, click on the white arrow next to your name on the top right of your screen (or go to https://developer.similarweb.com/admin/account). 

The Overview section will provide you with your remaining API hits, while the API Usage section will provide you with a breakdown of which endpoints you have used (this can be filtered by Year, Month, Week, and Day)