Exhaustion is the main reason I and lots of people quit following a plan. Another reason: catastrophic circumstances. Have you considered goal setting and time framing, monitoring, and journaling to follow your plan?

You must be in control or have autonomy, to set goals, move through intrinsic and extrinsic motivators, and grittily, hardily, toughly keep on track — especially if your choice is to be or continue being a successful high-performance athlete.