With regards to resolutions, particularly failed resolutions, most people get caught up in the past mistakes and failures so much that they spiritually paralyze themselves. You have to keep in mind that you are human and you can always make mistake.
Remember that it is not your mistake that defines you, and those mistakes do not have to define your future, but they can always help you focus your future. To improve your spirituality does not mean being pious; just a few changes in your life can bring significant effects to your life that can help you towards your goal of empowering your spirituality.
The following can help you have an in-depth understanding on how you can enhance your spirituality: