There are many ways to celebrate Christmas. Hope some of these might help.
Decorate your home for Christmas: you can put on light, set up and decorate a Christmas tree and hang mistletoe in the doorway.
Invite friends and families to spend time with you, this is a good idea to celebrate Christmas. Spend this time with people close to you so you can enjoy one another's company. You can also have them for dinner, watch movies together and make merry together. It's a season of love, what better way is there than to spend it Christmas with people you love.
Spread love and kindness: this season is a good time to give love, to be kind and generous to the less privileged. Give out and help someone this season.