When it comes to traditions, you need something old and something new.
Every newly married couple knows they need to honor some traditions they grew up with and build new traditions for their new marriage. Stepfamilies have the same task but it’s more complicated because a lot more people are invested in the old traditions. So, decide on a new tradition, try it, and see what happens. If it doesn’t go well you’ve learned something. If it does go well you’ve gained a new tradition and everyone contributed to the process. Hey, that sounds like a family being born.