SEO strategy for a new shopify store with low competition

Hello guys,

I have recently launched my ecommerce business with shopify. I have about 40 products in the handmade niche.

Before writing titles and product descriptions, I did some research and picked 40 low competition KW’s (400 – 500 monthly searches) and used those.

Some of my KW’s are already ranking in top 3 pages of google. I think a have a very decent shot to rank these keywords in the first page (low competition and seems that most of my competitors don’t even know what SEO is)

But I’m a bit stuck. What would you do to achieve this goal?

Status:

-No backlinking done so far (no budget for these now..)

-Website speed is not yet optimized (50 mobile / 84 web on Google Speed Insights metrics).

-The keywords are interlinked, so it’s difficult to write a blog post for each one. Best I can do is 5 blog posts for all 40 KW’s.

Thank you for the help