Let it sit for a while in a protected area off the ground so air can circulate around all sides. This is so moisture content can stabilize throughout the piece. This may take a few weeks for 1x stock, longer if thicker.
If after this the piece is still warped, I agree, that's the way it wants to be and there isn't much you can do about it.
If you do decide to plane it, wait until it is stabilized.
If after this the piece is still warped, I agree, that's the way it wants to be and there isn't much you can do about it.
If you do decide to plane it, wait until it is stabilized.
