[pasbesoin]

You are not motivated. Find something that motivates you. It sounds/reads like your current job may not be it -- or may not be sufficient, even if it's not deficient as work / a job.

Pay close attention to your physical health. Lack of physical well being can sap focus and energy as quick as anything else. If you're not exercising, do so. It doesn't matter so much what, as long as you enjoy and/or engage in doing it.

Pay attention to your personal life. (You have one, don't you?) Many jobs cannot meet all aspects of most people's personal needs.

With respect to the latter two, it's difficult to build solid work on top of a shaky foundation.

P.S. This represents a few suggestions. It's simplistic, not comprehensive. After all, I don't know you from Adam/Eve.