Most landing page problems are not design problems. They are clarity problems, and they show up long before anyone argues about colour. The fastest way to see what your page actually communicates is to compare it against pages that already do the job well. Browsing real, shipped examples beats mood boards, and a good place to start is land-book.com, which lets you filter by section so you can look at pricing blocks or hero sections in isolation. Run the five checks, write down what fails, and fix the worst one first.