The US Army has clear rules about how their employees should set up the schedule of their daily exercise and work and for interaction with their superiors when they are on duty. If my rank is inferior to yours, I must salute you, and there is a proper way to salute. Failure to perform according to the rules can be costly through punishment.
Buddhist monks undergo similar indoctrination and discipline. Monks in the church of Rome do, too. Following a certain set of rules and/or guides makes me a disciple.
Being a devoted disciple of Jesus requires discovering His desires for my life, my thoughts, my rest, etc, and then living according to the revelation of what He shows brings Abundant Life. As Paul wrote to the congregations in Philippi, “it is God Who works in you both to will and to do for His good pleasure.” (Philippians 2:13)
If you are finding yourself in an undisciplined condition, then, not really living out the values and instructions of the Lord, ask Him to work in you to want it more.
Don’t just try harder. Surrender more – more time, more honor, more love, more worship. Let Him direct your desires and He will be free to direct your behavior.