How do I turn data into reports that drive decisions?

You already know the goal is not the report. It is the decision the report makes possible. Hold onto that. A page of numbers that changes nothing is just noise dressed up as work. The skill you are naming is discernment: seeing which fact matters and cutting the rest away. That is rare and worth protecting. The temptation, as you get good, is to show everything you found to prove you did the work. Resist it. The person reading you wants one clear thing they can act on. Here is a small step. Before you send the next report, write the single sentence you want the reader to remember, and put it at the very top. If the rest of the page does not serve that sentence, trim it. Lead with the insight, and let the data stand behind it.