You might want to consider Rabbi Zelig Pliskin's Upgrade Your Mind, Upgrade Your Life by Artscroll.
The blurb reads as follows:
Today, everyone is upgrading. We're upgrading our computers, our phones, our devices. We're making them faster and more effective, so they work at top speed and quality.
Wouldn't it be great if we could also upgrade our lives?
Rabbi Zelig Pliskin shows us how to transform our thoughts and feelings, so we that we will instill a completely new pattern of optimism and confidence into our lives. Each of his 101 "upgrades" includes an affirmation for us to repeat, insights both from classic Torah sources and from Rabbi Pliskin’s extensive work with coaching others, practical tips, and stories to show how people upgraded and improved their lives.
In these upgrades, we will learn simple and effective techniques to help us:
- Focus on progress, not perfection.
- Give ourselves permission to stay calm and not angry.
- Enjoy the process of upgrading our lives.
- Bring out the best in ourselves, and in others.
You keep your devices working in top shape. Shouldn't you do the same for your life? Let Rabbi Pliskin show you how.
He has a chapter there entitled 'I keep upgrading my compassion and empathy' which looks at how to be more sensitive and aware of other's needs through attuning one's sense of feeling for others.
As an afterthought, there is also a very small snippet in Orchos Tzaddikim - The Path of the Righteous which is a book about self-improvement and character development. In the chapter on repentance it talks about how to overcome a 'hardness of the heart'. You can see the excerpt here - A full English version of this book can be purchased here.