I take flu shots but i catch cold too often even i live at warm climate, what should i do, to not catch cold?

Hand Hygiene: Flu shot will not prevent common colds. Clean your hands with soap and water or with hand sanitizers. Avoid touching your eyes, nose and mouth when at work. Adequate sleep, rest and a balanced diet to optimize your immune system. See a doctor to r/o diabetes or other health conditions if the above does not work.

Avoid colds: To avoid getting an upper respiratory infection practice excellent hand washing. Wash hands frequently & thoroughly with warm water and soap. Do not touch mouth, eyes or hands unless hands are clean. Avoid contact with people who have upper respiratory infections. Cover coughs.