Not all of your site visitors are ready to talk to your sales team or see a demo of your product. Someone at the beginning of the buyer's journey might be interested in an informational piece like an ebook or a guide, whereas someone who's more familiar with your company and near the bottom of the journey might be more interested in a free trial or demo.
If links and looks are set, begin interacting with the page. Abandon it, adjust the window size, convert. Are error messages appearing when they’re supposed to (if, for example, you don’t input all the form’s required info)? Is your CTA button working? If you abandon the page, are you retargeted with ads? When you resize the window, does your landing page respond accordingly?