I’ve noticed (and I feel the temptation too) to think of task management/PKM/bullet journaling/jorunaling/whatever as a binary thing — either you have some incredible complicated system which you use everyday the way the gurus on YouTube use theirs, or your “not doing it right”.
Task management is about managing your task. If a post-it works for you, that’s great! You have a system that works.
PKM is about storing and retrieving ideas - if a pocket notebook works for you, great! You have a system that works.
Journaling is about getting thoughts out of your head and on paper. If you do that every now and then and find it useful, great! You have a system that works.
Maybe you would benefit from adopting some practices or ideas (or more consistency) but you shouldn’t do that out of some sense of envy or guilt. You can always try things out and stick with what works for you.
Give yourself grace to experiment.