Semrush says my content is less than what it is

Hello,

I will try to explain my problem:

I started a ecommerce few months ago, added like 1O products and did 3 articles ( yeah i know, now a big deal but i'm working on my company all day so i do little by little)
I think my site structure and stuff are good, semrush says thats good enough.
Let says i sell pineapple juice, and my website is called mr juice. I start (without backlinks) rank on "mr juice", but still 0 positionning on pineapple juice, or even long tail with pineapple juice in it.
I did a seo on page audit on semrush and it says that my category page contain 900 words (it contain like 2400), i don't know how to fix it, and i think the problem is google don't see my content.
I use porto theme, and to put my text under my products (remember its a category page), i used template build / shortcode. I tried to put a cannonical url on the template, am scared about de-index it cause the content is used in category page.
I don't know if my problem is clear to you guys, but help would be so much appreciated.
Regards !