I know that a long covid (LC) symptom for some people is microclots, changes in blood chemistry. With LC it seems everyone is different. It would be good to check with your doctor on this; blood clotting is important to vascular health and easily managed. Being dehydrated can change coagulation, as can natural and medicinal blood thinners (various foods, aspirin, warfarin). It is good to drink enough water, and not try thinners without a doctor (most have some side effects, like hard on GI tract, excessive bleeding, food interactions).