Can’t win the buy box on a listing where all sellers are FBM

Listed an item a couple weeks ago FBM bc it was meltable, so I couldn’t do FBA. I figured FBM is fine be everyone is selling FBM. We are all listed at the same price, however they all switch off the buy buy box, and I haven’t gotten it once. My account is perfect health, and I have been selling longer than 90 days. Any tips or anything that I can know as to why this is happening, and how to prevent it moving forward? Or maybe I’m worrying to early as it’s only been live for a couple weeks. Thanks!