Does it seem like you are always getting sick?
How you respond to an infection is largely based on the strength of your immune system and overall health. In a day and age when both avoiding infections and also having a strong response if you catch one is so important, it makes a lot of sense to focus on supporting this system so it can provide you with the greatest protection possible.
Find the root cause.
The first step is to find out what is weakening your immune system. Are you not getting enough of the essential nutrients in your diet? Or eating too many refined and processed foods that are inhibiting its proper function? Too much antiobiotic use, or even just the use of certain medications which act as immunosuppressants can all have harmful effects. Other causes like chronic infections or excessive stress can play a role in this root cause as well.
Having someone assess you properly and uncover the major areas of concern will bring you one step closer to knowing which treatments options will work best.