I have read all 3 alhamdulliah about 10 years ago. Been in the company of many scholars and sheikhs attempting to understand the order needed to achieve proximity and believe that it is possible to achieve tazkiyah of the soul just via the avenue of tabligh if executed correctly. This is not a fool hearty remark, my journey goes all the way to India, Pakistan and in the company of sheikhs from arab backgrounds also. You comment leads me to assess that you have not understood the capabilities of tabligh or yourself are not engaged in the effort to the extent that you have understood the possibilities. I suggest you study Hayatus Sahabah with a scholar who has spent one year in Jamaat and has a strong connection with NizamUddin ulema preferably the Shura there as a start...