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I have a high palate, and Im wondering if mewing would be bad for me
Take a look at the video. This is about the use of an appliance that essentially does what the tongue does during mewing. It's very informative and entertaining and it shows how the palate expands and the vaulting drops over time. (If you want to skip the pre-amble then start at 10:27).
The difficulty with a high arch (I have one too) is positioning the tongue so that the upward pressure fully extends over the whole of the palate.
Best wishes with your ongoing research.