Make it Vegan: there are several great brands of both sweetened condensed coconut milk and sweetened condensed oat milk, either of which would make for a great dairy-free swap in regular 'mylk' form, as well.
Swapping Spices: you can use any mix of whole spices that you'd like, but the traditional version calls for clove & cinnamon. Nice additions of alternatives would be allspice, nutmeg, ginger, or cardamom, just don't forget to pick them out at the end!