It’s really hard to improve something you don’t measure. If you don’t know how many people take the action you care about on a certain page, every design decision essentially becomes a guess and you can’t tell whether it helped or hurt.
Decide on the single action that counts as success for each key page, like a demo request on the homepage or a signup on a landing page. Then set up tracking for it in your analytics tool, usually as an event or a goal. Once you can see that number, you can compare it before and after each change and learn what actually works.
This doesn’t mean you don’t care about intermediate steps or other data, like how many people landed on the page, how long they were there, or how many people left after a short time. But it does mean that every page should really only have one job, moving people further down the funnel, and tracking too many conversions can make it harder to understand your analytics.
