Systems do not appear out of thin air. They are proposed, drafted, created, implemented, retired and restored through a consistent lifecycle.
Idea notes are the first stage. These random thoughts and realisations build over time, and patterns emerge showing big issues and their proposed solutions.
From these patterns, systems can be created to solve the biggest problems. They are unlikely to be great at first, but taking action and failing fast is far more effective than getting stuck in endless planning.
Once systems are created, they can be iterated. See where the friction in the system is, and think of creative ways to get around it. Don’t try to stick with systems that are annoying and difficult.
When systems become irrelevant, they can either be destroyed or banked. If there’s any chance it could come up again in the future, bank it.
Finally, for banked systems, recovery processes in the future may reactivate them when needed. Habits are easy to lose, so this reusability can make things much easier when the time comes.