I have a script that runs once a week, generating a new dated .md file with section headers (eg particular projects) and core info already populated. Throughout the week I just update notes in the .md file. If needed, I copy over things from week to week to preserve some context. I have another script the moves untouched .md files into an archive directory after some time has elapsed. I can then look over all of the day-to-day/week-to-week notes on a per-project basis at eg the end of the year, and have both a high-level overview and all the details.

When I need to let people know what I've been working on, or do standup, or remember what I did 6 months ago, its all there.