Okay, it is a pretty complex process. What you want to do is open 2 different tabs with Scratch, and on each of them log into an alt. These should both be the SAME alt. In the first tab, go to your main's profile and make sure your alt is not following your main. After you are on your main's profile on the first tab, go to the second tab and log out of your alt, back into your main. Then, go back to the first tab and follow your main from your alt. Staying on the first tab, refresh the page. This will automatically log you into your main. Then, go to your followers, and you should find that you are following yourself!
⬆READ DESCRIPTION TO LEARN HOW TO FOLLOW YOURSELF⬆ PS. Shout-out to Cow_Master7 for being my 250th follower!
