Need advice to choose my need

I'm looking for a niche for an affiliate web site

I have already the niche idea because it's related to another side hustle i have

In this niche, there are competitors in ecommerce, but no affiliation site : only some big website which do some blog article about my niche (with affiliate links)

So i don't really know if my niche is good or not

try it out dude
only one way to find out
Test it in a couple ways, if u see traction u can scale