@ChrisAldrich Thank you! It was harder than I expected, and a good personal development challenge. Now considering renewing for another 100 days, or perhaps just continuing to do it by default (not part of a project) and picking a different #100dayproject.
100 Days of IndieWeb still seems intimidating (despite my contributing almost daily to IndieWeb), so I may pick one of these:
https://indieweb.org/100DaysOfIndieWeb#More_100_days_projects