I journal a lot. I recommend finding a system that supports backlinking. That way you can link to some related topic (for example, link to "stress" for a note on how you handled stress successfully), and then use the backlinks to that topic to find what you're looking for.
Since I use GNU Emacs, Org Roam[0] was a natural choice for me. Other options include: Logseq, Obsidian, and Notion