In a pot, Kentia palm (Howea forsteriana) browning is usually from underwatering, not overwatering. The soil description "powdery" confirms it's too dry.
Lift the plant. If roots circle the pot or it won't come out, repot into a container 10 cm (4 inches) wider in diameter. Use a mix with good drainage and a small tray.
Consistent moisture (not soggy) and a slightly larger pot will restore green fronds.
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