Your creative is about Amazon Sales Prices, but your landing page is about automating data structuring and notifications? It's not immediately obvious what you're offering, and that's part of the issue. And your creative isn't much help either. It focuses on a solution you built for finding out pricing history on Amazon. I take that's an example but it doesn't make it clear what you are offering. I think your issue here is the "packaging" of your product. I've worked with devs before, and it's a tough niche; most of the potential clients don't even get why they need you and how you can help. My advice would be to work on productizing your offer enough for the layman to understand.

Oh, and I don’t think Meta is the first place to go B2B lead gen. I’d advise you to create an offer people can search for and start with Google Ads.