Rather than focusing on what I should do in the new year, I found it to be much more helpful to focus on what God did in the outgoing year!
Every year I am surprised by how long this list ends up to be, and every year again I find that He has proofed himself faithful, merciful, forgiving, loving and good beyond comprehension in my life. I fall short of the glory of God, He never does. I would again break all the well-intended New Year's Resolutions within a few days (or weeks at best). He will again show himself faithful to His word and He will again keep all his promises :)
As C.H. Spurgeon used to love to say: "Look to him, dear sinner!"