My baby is 12 months and I have him on that formula for 8 to 18 months and I do half homo milk. I still have him on the formula because he doesn’t eat as much solids only takes fee bits so I still have the formula so he gets all the nutrients he needs. Calcium and iron are really important still. But not sure how well your baby eats solids. I would definitely try the half and half
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I had my son on formula at 7 months and then went to homo milk at 9 and once he had that he never wanted formula again. So not sure that will happen with your breast milk but otherwise no change that I recall.