Take vitamin C up to 3000 mg per day (at intervals), three times the recommended D3, at intervals, zinc tablets at least twice a day!
We have Thai herbal capsules for flu and early virus infection called Fah Talai Jone.
https://decostrade.com/en/health-products/fahtalaijoneandrogphispaniculate100capsules/
It has been proven to be effective in getting rid of coronavirus for early symptoms. Thai people take these immediately when we have fever, cold or cough.
Cheers.