You can take your foot off the gas without forgetting where you are going.

Slowing down and giving up feel similar only if your commitment is measured by speed. Direction is a separate thing from pace, and you can hold one steadily while varying the other. People who never ease off usually do so because they fear that any reduction will turn into a stop, which says more about how the goal is being held than about the goal itself.

Try a deliberately slower week on something that matters, without changing the destination. Keep it moving at a lower rate. Proving to yourself that the direction survives a slower pace is worth the experiment.