How to get senses of taste&smell back after healing from covid-19?

Unfortunately time is the only treatment; there is nothing you can do to get it back.

Although this is common, most patients do retrieve sense of smell and taste within several weeks. On occasion, might take 3-4 months. Although there is no established remedy, some have had benefit from zinc, vitamins C and D, but this is anecdotal. Discuss with local doctors and see if they might agree with such an approach. Otherwise, will take time.