How the fertility problem in males be improved?

Depends: It depends on the type of problem and cause. If it is a hormonal problem, then hormonal replacement may help. If it is due to nonfunctional testicles, there is no medication or surgery to help. There have been some studies that looked at steroids, antibiotics, and Clomid (clomiphene) for males for testicular failure but the results are very poor.

Improve Sperm: I agree with others. Let me add that you need a complete eval including your partner. Be healthy and avoid smoking, alcohol, heat (hot tubs-sauna-baths), extreme sports, recreational drugs, some meds. Surgery may help for varicocele, fertility meds have limited value. Ivf with sperm injection (icsi) works if nothing else does. See specialists for advice after diagnosis.