Healthy self-improvement is the one that helps you to improve your knowledge, status, or character by your effort, the one that works best for you. It also means to strive to do better in all aspects of life without stressing ourselves out too much.
Difference between self-development and self-improvement
Personal development is no different, it refers more to the daily processes we go through that contribute to our growth. On the other hand, self-improvement focuses more on results.
(Unhealthy self-improvement is when you tend to set unrealistic goals)
Take time to do what makes your soul happy.
And remember to seek professional help
if you need it!