Is there a reason that my nose would still be stuffy after being sick with covid right after christmas?

Allergies. Season is starting in DC I think. See local Dr who knows what is going around in DC.

An allergic reaction, sinus infection or irritation of the nasal passages is possible. Rinsing nasal passages with saline may provide relief. Watch for signs of fever, cough and difficulty breathing. A re infection with COVID should be ruled out with a screening test.