Create immediacy through the template:
Ecommerce or not, this is a common method that many follow and the festive season makes it even more special. Try to put words that subtly ask the recipients to hurry up and make the purchase or subscription. This sense of immediacy should also be backed by relevant actions like clicks on specific links and CTA buttons.
Be sure to include numbers:
Numbers and figures are associated with the psychological side of marketing. People are somehow attracted to numbers. ecommerce will invariably talk about discounts and offers. All you need to do is incorporate numbers in your template and make that section stand out.
Be more apparent:
Sales and offers are aplenty during the holiday season. You as an email marketer need to be clear in this respect. Tell your subscribers that you are providing them with a sale that makes it different from the others. Make the magic words, 'sale' and 'offer' more prominent in your template to fetch more attention.