Parlour Palm

Hey guys! I took over a dying palm and I have no experience with palms, but it hasn’t grown even a centimeter in 4 months. Are they just slow growers? It’s not really crispy anywhere, just 2 small brown tips. Is there anything I’m doing wrong? It’s in a plastic container (with drainage) and well draining soil. The pot is about 2-3 inches bigger than the root ball. It sits in the window sill and gets constant humidity.
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