Anyway, what've been the most self-effectiveness/ empowering habit(s) you developed for becoming a Fastlaner or do you think it/them helped the most?
By far the most effective and empowering habit you can have is to consciously become aware of and systematically eradicate FEAR from your own personal being.
If everyday you sat down and analyzed your negative feelings from the previous day and then traced back which fear those negative feelings came from, then made a plan to actively face and get rid of the fear; You will be much more happy, much more efficient, much more understanding, empathetic, effective and more. There is literally no downside to getting rid of fear. It will help you in all aspects and in all facets of life.
All self sabotaging behaviors and habits are results of underlying fears. Fear of Judgement, Fear of Change, and the biggest of all Fear of Inadequacy. Explore these fears as they are the most common in our western culture. See if you can become aware of how they are expressing in your own personal being and make the commitment to change.
Best of Luck