Firstly, don't panic. Your Yoti is protected by multi-factor authentication. It’s linked to your phone, protected by a PIN that only you should know and uses facial recognition for added security. Hopefully, you've also got a lock screen on your phone with a strong code or fingerprint.
If you stored a recovery key in iCloud or Google Drive after you created your Yoti, you will be able to recover your account when you log back in with your PIN.