Small improvements can be more useful than a new productivity subscription. Apple’s latest Notes supports Markdown copy/paste and section links, which could help organize a long project note into Decisions, Open Questions and Next Actions.
Try it on one scratch document before changing where you store project notes. A useful section link should reduce navigation, not add another organizational ritual.
Action: paste a Markdown checklist into Notes and create a link to one heading. Confirm the features are available on the Mac you are using.