How do I increase the amount of sperm I ejaculate?

Less sex more health. Increasing the interval of intercourse up to about 3 days will improve the concentration of sperm in your ejaculate. The volume / concentration of sperm can be decreased by smoking, illicit drug use, illness (like the flu), and poor nutrition. It takes 90 days of lifestyle change to improve the health of the majority of sperm and their numbers per ejaculate.
Sperm Quantity. The amount of semen is not the important factor for fertility. The number and quality of sperm are the important factors. The frequency of ejaculation can alter the number of sperm in the semen specimen. Prolonged abstinence increases count but mostly extra dead sperm. We usually recommend 2day abstinence to maximize numbers for fertility. Too frequent a problem if counts are low. See specialist.