It can be done. Please share your store url.
Ash here from the Shopify team. Welcome to the Shopify Community!
It should absolutely be possible to have your Buy Now button on the home page linked to your product page, rather than a collection page. I'm happy to help out with this change. Making this change would depend on a few factors, such as what theme you're using, and how you originally set up the Buy Now button on your home page. Please reply to this post and provide the following so I can properly assist you:
I look forward to receiving your reply and taking a closer look!