Ah! Well to be honest the easiest way to do that would just be through the forms reporting tool. If you go into marketing > forms > Analyze then filter by your specific date (let’s say the past year) at the top. You’ll see a table at the bottom listing all your forms, if you simply click on submissions you can change how it’s arranging them, click once and it’ll show most submissions to least, click that column header again and it’ll show least submissions to most, so it will show all forms that have had 0 submissions within your date range at the top!