To author, nice app. You handled few of the edge cases for ideas submission. Kudos.

I think you should add email option where a subscriber can get a mail every day about the most upvoted ideas. This way it'll be more collaborative. You can open up a discord server where people can discuss all the submitted ideas.

Also you need to add spam protection when someone added an idea. I just added an idea with text: "BLA BLA....". Prevention from spam and Bot protection will helps.