There are no magic answers for how you can be more peaceful. Like anything in life that's worthwhile, desire, motivation, and effort are required. However, it's important to stay relaxed about the process. If you agonize over how to be peaceful and harmonious, you may slow down your own progress.
When you make a conscious decision to walk in peace and harmony, it doesn't mean that you'll never get upset again. Life always brings challenges. There are always issues that can get you down if you let them.
If you have peace in your life, though, you'll see a lot fewer of those upsetting times. And with more peace in your heart, you'll perceive your challenges differently.
By learning about yourself, you'll learn what really matters to you. You'll be able to let go of the little issues and focus your energy elsewhere. By directing your thoughts and time toward what really counts, you'll have a lot more harmony and peace. And although the process takes time, walking your unique path to peace adds richness and deep joy to your life.