Should I target my main keyword on my homepage or main collection page? (Shopify store)

Hi everyone

I sell roof tile vents, so my main keyword is “roof tile vents”.

Is it better to focus on that keyword on my homepage or collection page that contains all of my products?

At the moment I am doing “roof tile vents” on my homepage and a long tail variant of “roof tile vents for extractor fans” on my collection page.

Would it be better to change my homepage to focus on my brand name and “roof tile vents” on the collection page?

Thanks