Where are you sourcing your cum from? Is it good quality cum, or are you importing sub-par cum from questionable manufacturers. It could be that customers aren’t satisfied with the optical cum you’re providing, or your competition just has far better cum at more competitive prices. You need to take into account the consistency/viscosity of the cum, the volume, is it transparent or fairly white? Watery or adequately sticky? Maybe it’s too salty and burns the customers eyes. I’d also offer referral bonuses and maybe for every friend or family member, customers get their next cum 50% off or some kind of store credits!