you’ll know once the ratings close at the end…until then, why stop! keep rating a few per day and people will keep rating yours, the more ratings the better

oh, and to directly answer your question, the “weighted” ranking for your game is modified by how many games you’ve rated, so the more games you rate the closer to the beginning of this list your game becomes. (so you can keep rating games, to a point, to keep your game up on the first page of 20 that everyone sees) (at 100 ratings it no longer modifies that score so past that point you’re just rating for the sake of rating)

I think bronze is 50 games rated, silver is 75, gold is 100. If you click Play and Rate Games (Random 20) they will show a list of 20 games, with most of the games having been rated less than the author has rated other games.