Should I sell single or multiple products in my niche?

Hello all, after months of prototyping and testing, my invention is finally ready for mass production. I invented something in the Golf niche, a single product. I plan on selling through my own ecommerce website, and since I'm already doing FBA, I'll sell on amazon too.

My question is, on my own ecommerce website, should I sell other items on my site or just the product I invented?

Thanks!

from Should I sell single or multiple products in my niche?