If your Snapchat streak breaks accidentally, you can request a restoration through Snapchat Support. Open the app, go to Settings → Support → I Need Help, and search for “Snapstreak”. Tap “Let us know” under “My Snapstreak disappeared” and fill out the form with your username, your friend’s username, and the date the streak ended. Submit the request, and if eligible, Snapchat will restore your streak within a few hours or days. Make sure to resume sending snaps to avoid future breaks.