I've found BuiltWith effective for this kind of thing - especially regarding lead gen - but they are quite expensive. If you can provide a similar service and cheaper I might have paid for it. (Not so much these days as I'm working on something else).
Cool stuff! If you want to add more detection strategies, you might find https://page.rest useful. It can help you to easily check meta tags, script sources and headers for hints.
It gets my website slightly wrong because it claims I'm using iwantmyname.com as a host. The domain actually points to an AWS S3 static website bucket. I think that makes AWS the host.
https://siftery.com/categories/languages-and-frameworks/lang...