Did you before blocking them?
Why? Because if you unblock them, view their profile to "check" on them, and then close the app, you have no way to find them again unless they add you first. Snapchat does not have an "Unblock History" log. There is no receipt. You get one shot to search and add before they vanish into the algorithmic noise. how to find someone you just unblocked on snapchat
Emma decided to try a different approach. She tapped on the "Add Friends" button and then selected "Add by Username." She typed in Rachel's Snapchat username, which she still remembered. A few seconds later, Rachel's profile appeared on her screen. Did you before blocking them