Started a SaaS business, where to start for the SEO

Hello peeps,

I have started an AI saas business 3 months ago and after getting some initial customers in shopify ecosystem, I am looking to expand my user profile to other eCommerce platforms as well.

I rank badly on google on product description niche and I want to improve my SEO. Can you point me in a direction where to start?

Thanks a lot 🙏🏼

Fyi: website: TextCortex AI Product Description Writer