ssorry but no. Cadiva69; if you enable 2FA after you are hacked (actually sometimes you can if account changes) then you are done for, cooked, you've handed over control.
APples 2FA will not challenge an already authenticated device. So the moment that happens they can use a device that they're signed in on to change your password, add phone numbers to your 2FA, remove your email address and lock out your other devices.
HOw do I know? When I enabled 2FA I wasn't asked to challenge or auth my Mac or iPad. Not until I changed my password and signed them out.
ENabling 2FA when you're already hacked could be a suicide pill