Google search ads to my product page

I have tried this and also from Facebook. Can’t measure any sales from it unless I redirect through a landing page. And so I stopped didn’t see any increase in sales.

It’s maybe costing me 3 times the product price to get sales via Amazon PPC even though it’s not optimised this looks bad. Not clearly sustainable.

I saw brand rewards but need to be brand registered. I’m not very small time player so far. I’m not opposed to it just getting started.

But the cost of Amazon PPC suggests trying external advertising.

I also have affiliate links I could put in the Google and setup but fear to get some account suspension.

Google search doesn’t give me any real solid advice. I feel. So any thoughts? Thank you.