What May Be Happening
Starting and sustaining are different stages. A beginning may be carried by relief, excitement, urgency or the feeling of a fresh start.
What Might Be Underneath It
Ask what the momentum was depending on: motivation, external pressure, visible progress, feedback, protected time or a very clear short-term goal.
Separate the Decision From the Fear
The starting pace may have been too intense for ordinary life. A slower continuation can be more durable than another dramatic restart.
Make the Next Movement Smaller
Momentum weakens when the next action becomes vague. Make the next movement visible and give it a cue, time or place.
Continue
If you stop when progress becomes real, explore Why Do I Stop When Progress Begins?. Or begin the Recognition Quiz.