Only thing I can think of on how this would work, if it you had some unique content/description for each product, which is SEO optimized, and get some organic traffic from google to specific pages of your site, but I don't know how doable it would be to do such thing
That's not marketing. That's something that you made yourself. Why do you think McDonalds doesn't make computers? Or why Adidas don't make hamburgers? That would mean more money, right? NO, that's not right. Marketing thousands of products is NOT an easy job, and you really need to be a professional to understand how to do it. Instead focus on something ONE. You can make thousands of dollars from just one niche, if you master it.
"Why focus on 10-20 products when there are 7340 products that you can earn commission on" This way of marketing