To reactivate your account, just log in to the Snapchat app with the username of the account that you want to bring back. You have 30 days to reactivate a Snapchat account that has been deactivated before it is scheduled for permanent deletion.
Please Note: You cannot change your password or use your email address/phone number to log in to your account while it’s deactivated. Permanently deleted accounts cannot be reactivated.
If you’re located in India and delete your account, it will deactivate for 30 days, during which time it can still be reactivated. After 180 more days, your account will be permanently deleted, in adherence with local guidelines.