I have cough what we have to do?

More details are needed to answer this best. I wonder about the following, seasonal allergies, sinus infections, post nasal drip, reactive bronchitis. It is COVID 19. See a doctor via telemedicine

If cough lasts more than 2 weeks, it would imperative to see a doctor. If you have breathing difficulty or fever, see a doctor now. For uncomplicated cough you may take over the counter cough medication. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.