The bullet journal system is nice because it doesn't depend on consistency. There's no overhead, it's just a way of writing things down, so you only need a cheap pen and cheap notebook. Even if you lose them, just grab another. If you forget to use it for three month, the bujo doesn't care. It's there for you to use again when you remember.
If you look online you'll see lots of people who plan their whole year out and call it a bullet journal. But that's something they've built on top of a very dimple, elegant system, not the system itself. Don't do that shit, it doesn't work for people like us. Garbage notebook, garbage pen, bulleted lists, migration. Keep it simple.