I suppose my first question is: what tool are you using to perform the SEO site audit, please?
Secondly, I just want to ask if you’ve checked our own guides on ensuring your store is SEO optimized. For example this document on adding keywords. We’ve even got a video here:
When it comes to configuring the metadata on your homepage specifically, you need to go to Online Store > Preferences in your store admin. There’s more on that here.