Self-improvement doesn't lead to happiness if you lack community. Humans are social creatures and you shouldn't ignore how others within the community impacts the self. If you try to derive your entire existence through only yourself then this is a path to being narcissistic, cold, closed-off, sociopathic and isn't actually a good outcome. There is a balance to be had like most things in life but a person's community does impact their happiness.

There is a huge problem with social cohesion in society right now and it is negatively impacting people's emotions immensely. Ignoring it and focusing on yourself doesn't make it go away. You might be distracted for a time as you focus on yourself but eventually any self-improvement leads to a desire to integrate one's self-accomplishments into the community to gain positive feedback, appreciation and acknowledgement from the community. Without social unity in our society, many people are lacking this. To suggest someone should see a psychologist because they desire to be loved for who they are by the community is pretty damn harsh and really misses the underlying problem here. Our community is disjointed, immoral and is sick. That's the problem.