For December, prepare your heart by making room at the Inn.
Check out this article about preparing spiritually for the Nativity of the son of God: https://www.ncregister.com/commentaries/advent-decking-our-souls-for-the-nativity-of-christ.
Use an Advent Examen to help reflect on what you can do to prepare for the Lord: https://www.ignatianspirituality.com/advent-examen/.
Advent is a great time to attend confession. Prepare using this Advent examination of conscience: https://drive.google.com/file/d/0B-CPseilPYNzOVdvOW5MRHpSb3UzSTU5amtCZHQ5M1E4VjJB/view.