Maintaining a healthy lifestyle
Try to create a healthy menu for yourself, which combines food that strengthens the immune system such as foods rich in Vitamin C. You can read about this in various sites dealing with healthy eating.
Try to maintain balanced sleep, both in terms of the numbers of hour of sleep and their dispersion throughout the day and night. Our body needs a steady balance and cycles of rest and awake activity.
Integrate physical activity into your routine. Whether through minor activities (such as taking the stairs instead of the elevator) or by joining a club or fitness center. If you find yourself in isolation, you can use YouTube to find various sports and exercise activities which can be performed in any room.