So I've thought about submitting 3 different games in the google forms, but I'm already a mod of two different games, idk if I could moderate more. How should I get around this problem?

Does it matter how many games you moderate? I don't think there is.

There is no limit to how many games you can moderate, but it is good thinking realizing you might not be able to handle them all at once if they suddenly gain popularity.

You can always ask people in the community to help you moderate those boards.