I use various. If it's in a business context use "kind regards". If it's a non-pagan friend I say "be well". Af it's a pagan friend I use either a plain "blessings" or I might embelish. Examples could be "blessings of the wild seas" or "blessings of the returning light".
Like any writing, it is important to be audience specific. Would you say it to them in person? If not, don't.
Blessings of the mists that kiss your face in the darkness,