6. Tap on I lost my Snapstreak
7. Scroll down and fill up the form asking for your information; once you are done and have written about your issue on the What information should we know? Text box, Tap on Send
Do note that if the hourglass icon had appeared before your Snapstreak disappeared from your Snapchat account, then that means your Snapstreak went away naturally due to not getting a Snap from your sending nor sending one yourself to the friend and hence Snapchat won’t restore it.
If the Snapstreak disappeared for any strange reason, you can write to Snapchat support and get it back.
With this, you should know how to get streaks back on Snapchat, although it will depend on how you lost your Snapstreak.