At the moment there’s no way to search for public collections - and if there are plans for such a search feature I missed the announcement. So having your game featured in a collection would usually just reach a really small group of people.
You could add some more tags to make your game appear in more tag based searches. Like the “Average session” length, “Languages” English, the general tag 2D seems fitting, list the “Inputs”, “Accessibility” Configurable controls (if it has rebindable keys), add “Made with” RPG Maker (Yes, there are currently 2 tags for each engine - I hope that gets unified and becomes searchable in regular search soon-ish.), …
That’s all that comes to mind right now, but if you look around at some of the popular games you might get more ideas.