What Tennessee Jed said. Also, the timing of your repetition is pretty good. I'm usually ready for a refresher by then. But definitely, don't go over the same old ground again if you don't feel like it. And definitely write about other stuff too. I enjoy your writing on whatever topic! But this should be fun for you. If it ain't fun, don't do it. (Unless you are one of those poor doodlers that really needs the pennies you get from monetising your Medium stuff.) You ain't changing the world, no matter how good your columns are. A mind here and there, sure, but it doesn't add up to much in the big picture.