Note.

When someone blocks you on Instagram.

And you want to block them back.

But you cannot find their account because they have blocked you.

Search for them from your second account.

Block them on your second account.

Come back to your main account.

Go to your block list.

Scroll down.

Click on “People you might want to block”.

The accounts you’ve blocked on your second account will be listed there.

That’s how you block them back.

You’re welcome =)