Great sales is a byproduct of a great product. Focus on the needs of your customer (talk to them) and build a product that solves their problems, saves them money, or helps them make more of it.
Regarding nuclear waste: first off, the amount of nuclear waste generated today is drastically less than in the past. During WWII and the Cold War era the methods for processing nukes was extremely crude, resulting in an embarrassing amount of waste, which we are still dealing with today. Today, the amount of waste is small fraction of that. Second, the waste problem has been solved by vitrification. Vitrification takes nuclear waste (in liquid or solid form) and blends it with molten glass in a high-strength steel casing. When it cools, it becomes solidified. Then it can be stored in a remote location. Vitrified nuclear waste poses no acute danger to humans and IMHO is much preferred to the damaging effects of fossil fuels which include both harmful pollutants (Particulate Matter, NOx, Ozone, etc.) and dramatic acceleration of climate change.