Your routine should be able to survive real life.

Real life includes late nights, family emergencies, illness, and weeks that go sideways for no good reason. A routine designed for the version of you with time and energy is a routine designed for a person who shows up maybe half the year. It is not that you lack discipline. The thing was built for conditions you rarely have.

Test your routine against the worst realistic week rather than the best one. If it cannot survive that, shrink it until it can. A smaller thing you actually do outperforms a larger thing you abandon every few months.