Yep, henna is usually extremely permanent. When I went too dark with henna, nothing short of bleach would lighten it. Ended up cutting it all away last year.
Have you tried a heavy oiling since you hennaed? I've heard that can sometimes help fade it. Did nothing for me but since your hair isn't holding the henna, it might help pull out any left that you can't see.
Not sure how much you want to spend on getting your natural color back but I hear very good things about overtone and its non damaging.
https://overtone.co/collections/shop-by-color-brown
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