Tip: Open another question describing your idea, for a bit of free validation.

My personal test is what I call the "Sunset Rule".

If I can have an idea in the morning + generate a manual sale (buy hook or crook) before sunset, I figure my idea might be good.

If I can't, I doze the idea under, because it's 2021, so if an idea can't produce a sale by end of day... to me... it's a very bad idea.