It happens quite often that people make speedy progress at the initial stage of their practice, but the progress tapers off after some time. Worse, some may even stop practicing altogether.  This is mainly due to a lack of systematic approach to Buddhist practice. What should be done about it. 

First, we must understand what the foundational practices are and duly recognize the importance they command on our spiritual journey. If we try to practice the advanced teachings like the Great Perfection or Mahamudra without first completing the preliminary practices, no results will be achieved owing to inadequately prepared faculty. Thus, the foundational practices should be made the top priority for all who instead to bring their practice to fruition. 

~Depicted from FROM BELIEVER TO BODDHISATTVAS