I know we are not held for thoughts as the Prophet ﷺ said, but is this unrestricted, any thoughts as long as we do not act/speak them, or is there a distinction between intentional and non intentional thoughts. So if I have Kufr thoughts that I am scared were intentional, should I renter Islam?

Ustadh AbdulAziz al-Haqqan

No, you are not held accountable for thoughts, and you do not re-enter Islam. Take it as a rule you do not break, never retake your shahadah and never repeat anything you doubt, and if this keeps coming back see a trustworthy Muslim doctor.