Up the orange flavor - the orange flavor will increase the longer the sangria sits, but you can add 1/2 - 1 cup of freshly squeezed orange juice for a more citrusy drink.
Make a summer version - this sangria with Fireball is the ultimate fall pitcher cocktail, but you can make a summer version simply by adding a load more fresh fruit and removing the cinnamon sticks. You'll still get a cinnamon kick from the Fireball but it won't taste so much of the holidays.
Add rosemary - I know some people don't like herbs anywhere near their drinks, but if you do a fresh rosemary sprig added at the beginning of this drink, or even just as a garnish in each glass so you get to enjoy that lovely festive smell is quite nice.