Additional ways of working on yourself
The techniques on this site will help you the most, if you use them with other forms of self-development.
Several authors supply advice for the Enneagram types. On the web, you might find Riso & Hudson's recommendations helpful.
Meditation (e.g. Zen, mindfulness, vipassana) is particularly recommended. This helps develop self-awareness and presence in the current moment. Also it teaches you not to resist upcoming feelings and thoughts, but not to reinforce them either.
Most people will benefit from doing Yoga or T'ai Chi. This is not only good for your physical health, but makes you feel better emotionally as well. It gradually opens the chakras and energy pathways in the body. It also helps you becoming more aware of your body.
The work of A.H. Almaas and his Diamond Approach to Self-Realization is particularly recommended. At the center of this approach is a practice called "Inquiry", intended for investigating one's psyche, so as to be able to change by understanding oneself in detail.
The Eliza chatbot on this website, can help investigating oneself, and make ones feelings more conscious.