This strategy makes perfect sense, but how do you handle vacations?
I find it much harder to do that during normal time because there are pressures in every direction.
More specifically, if possible continue your routine on vacation. Your routine is what you do every day.
Then set a date after vacation and get back on the horse no questions asked
It isn't lapsing for a week if you were in a rut in the lead up.
Staying in that rut isn't a healthy way to live either. The alternative is to get out of the rut. Blaming fear as a roadblock is a separate issue, entirely.