I don’t think Belichick has many options outside of Atlanta and Carolina at this point. If he doesn’t want to sit out a year, Atlanta’s roster is actually pretty good and would probably win that division with any marginal QB upgrade.
The Chargers seem all in on Harbaugh, the Commanders want Ben Johnson, the Seahawks and Titans don’t seem interested, and the Cowboys, Eagles, and Raiders all seem to be keeping their coaches.
Unless he wants to wait to see if Buffalo would be willing to move on, Atlanta is his best option left.