You can use half and half, milk, or coconut milk instead of heavy cream, but it will alter the texture of the sauce. It won’t be as thick and may turn out watery.
Avoid overcooking the salmon. Cook it just until it flakes easily with a fork. Overcooked salmon tends to be dry and less flavorful.
The sauce will thicken up more and more as it stands. This is a good thing because it allows you to reheat the sauce without worrying that it will become too thin. Serve this dish immediately for best results. If your sauce starts to thicken, add a few drops of liquid and stir to thin it out. You can use cream, milk, broth, water, etc. Add more spices to suit your taste if you need it.