How to expand to different categories?

Hi,

My category is very niche and right now after 2-3 years of selling I am able to get in top 3 as per amazons search query performance with my market share of 25 percent.

It’s hovering around this week by week basis , sometimes going a little down but not up, I know managing this level is also tough considering the competition.

Earlier I used to try in other categories where after 10-15 failed product I was able to get a single product.

Now anyone can easily say the other failed product tought me experience but for me because of them I now evaluate every points for a product which somehow makes me to not try.

I don’t know which loop is this but I want to break it definitely . How you guys doing it based upon your experience? Any sort of framework you have adopted? Like introducing a set of products for every import/supply cycle?