Post covid inflammation remains for 3 months.
If your saturation is normal,above 95, stop doing blood tests.
They are neither helping you nor the doctors.
Low grade fever is a vague term
Fever is significant above 100.4 on the thermometer.
There is no need of naproxen unless fever and body pain are severe enough to limit your routine activities.
Next Steps
improve diet
start exercising to improve fitness.
everybody recovers ar their own pace, give your body time to heal.
take adequate rest.