Working on a planner doesn’t have to be an all time consuming task.
But I believe that everybody is capable of finding five minutes of their time to review the day ahead. Whether it’s jotting down a few notes about your day, or writing out a to do list, you can find a little time to do something.
If you are only working on it once a week, it may explain why you struggle with bullet journals. So simplify if you’re doing too much. Start small, and work from there. I work on the SAVERS/AVID programme, where I scribe in the morning and reflect at night.