When you've lost you 2FA, the first thing you should to do is to check if you've saved your 2FA secret code somewhere. If you find it, then reinstall the app on your device and enter the back-up secret code. You will then be able to log in using 2FA codes generated from the newly installed App.
The second thing is to consider using Authy app which does a backup of all your 2FA data. When you lose your device or wipe its data, you can restore all of your accounts linked to 2FA in a few simple steps.
If you don't have your secret code or it's not working for some reason, you should contact our support by emailing firstname.lastname@example.org from the email address linked to your 3Commas account and await further instructions from our Support Team.
The 2FA reset procedure can take up to 10 working days to complete.