Hi Rahul
The slight rise in lymphocytes indicates that you suffered from infection in the recent past (as is CoViD in your case).
If there are no findings in CT PNS, you need not worry about Mucormycosis (Black fungus).
Moreover you are only 29 years old and your reports are wonderful (witha a HB level of more than 15.
There are no chances of Black fungus in you as it usually affects elderly who are long standing diabetic, or on steroids or anticancer drugs etc.
Next Steps
Don't stress yourself about Black fungus and avoid that by keeping yourself away from social media and television.
Health Tips
Read good books, excercise and meditate.
Take high protein diet to regain your strength and immunity again.