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The 4:5 is actually an advantage because it takes up more space in your feed and captures attention better than the classic square. I wouldn’t touch old posts, dated content doesn’t penalize you, but from now on it’s better to produce everything optimized on that format: practical example, a 4:5 carousel covers almost half a screen and increases the dwell time. The logic is simple: if Instagram pushes a layout, riding it gives you free reach.
