can’t overstate how much easier it is for readers to process a sentence if you start with “but” when you’re shifting direction. Or, conversely, how much harder it is if they must wait until the end to realize that you have shifted. Many of us were taught that no sentence should begin with “but.” If that’s what you learned, unlearn it—there’s no stronger word at the start. It announces total contrast with what has gone before, and the reader is thereby primed for the change.