You can increase your sperm quantity and boost fertility by following a healthy diet and some to-dos like:
Exercising regularly and taking enough sleep.
Consuming enough of vitamin C, D, E, and B-12.
Quit smoking, if you do.
Consuming Ashwagandha, Maca Root, & fenugreek seeds.
Minimizing your stress.
Avoiding drugs and excess alcohol.
Get enough zinc and folate.
Consuming D-aspartic acid (D-AA) and Omega-3 fatty acid.
Eating more antioxidant-rich food.