Spiritual growth for men is not self-improvement with Christian language. It is the process of becoming more like Jesus in your home, work, thoughts, habits, and relationships.
Spiritual growth is not self-improvement
Self-improvement usually asks, "How do I become more impressive?" Spiritual growth asks, "How do I become more faithful?" Those are not the same question.
Identity before performance
A man grows differently when he knows who he is in Christ. If insecurity is driving you, start with how to combat insecurity and let God define what is true.
Growth through brotherhood
Men need brothers who call them up, not just content that informs them. That is why cohorts and accountability matter.