Thanks for contacting healthcare magic.
You have to increase your lymphocytes for improve your immunity.
First you have to drink 12 glass of water per day.
Eat more
proteins per day to increase your lymphocytes.
If you like green tea than it can drink.
Take more vitamins C vegetables like lemon , tomatoes. .etc.....
Vitamin C helpful to improve immunity.
Eat green vegetables and fress fruits.
Eat more seafoods that have more
selenium amount it help to protect a body against illness.
Eat carrots, spinach etc...that have
beta carotene. That helpful to increase lymphocytes.
Do regularly excercise.
Check your
body mass index .
Avoid stressful condition.
Take care.
Thanks.