If you want to predict the future, your analysis should be about 98% detailed study of the present, and 2% history. Much as you would consult mostly this week's weather forecast when deciding to go for a picnic, but maybe adjust slightly based on historical error rates in weather forecasting.
The real usefulness of history research in prediction/policymaking often seems to be in debunking popular myths that shape/bias how we analyze the future and present. The conduct of the Iraq War, for example, was substantially a result of a popular American myth/narrative about how other cultures are, deep down, like us, and democracy is the equilibrium every society gravitates towards. In hindsight those are both obviously false, but at the time a lot of people believed them. Historians help identify and make us cognizant of those narratives.