How can I improve my low sperm count?

Optimize health. Like most health related questions, fertility is linked to health in general. Avoid hot tubs, tight pants and long bike rides. Male anatomy is on the outside for a reason. A cooler temperature is optimal for sperm production. In the words of Michael Pollan, "eat food, not too much, mostly vegetables." That means you eat nutrients and avoid dyes and artificial processing that may affect fertility.