Here's an idea I had! 1. You take the URL of your most recent project, and change the last number up one or down one. 2. Comment: "We're project twins!! (Take your most recent project and change the last digit in the address bar up one or down one!)" (This step is optional, commenting this a lot may result in spam, feel free to skip this step!) 3. Complement the project and/or its creator! 4. B)
If you get nothing, try changing other numbers in the url! It's a great way to find random projects to complement! forum post explaining more: https://scratch.mit.edu/discuss/topic/578840/?page=1#post-6022058