The things you say you are doing are personal knowledge management. deciding what you are going to write down and how you organize it is personal knowledge management.

You don’t have to copy someone else’s zettlekasten or Johnny decimal system, or para or anything else. You don’t have to link, backlink, cross link, tag, or use a particular app, or any app at all. You decide what you want to record or retrieve later and you decide where and how to record it. That is personal knowledge management.