One foot in front of the other. Find ways to focus on making it a better holiday season for other people, even though you feel empty and lonely. That helps me feel less lonely when I’m struggling. Reaching out to others is really hard to do when you are feeling down, but it is also the only thing I know of that makes things better. Maybe you can try doing the things your mom would have done if she were still here for your other family members (bake cookies, stuff stockings, special recipes of her, etc). It helps keep your mom in the holiday season, helps keep you close to your mom, and will be very meaningful for others.