The only way this page could be better is if it showed some real gratitude to the new lead. “Yipee” might relate to the prospect’s emotion, but it doesn’t convey thanks on behalf of the brand. While your “thank you” page has a number of goals to accomplish, the first thing it should do is right in the name — say “thank you,” and make the lead feel like an invaluable part of the brand.
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?