My measure of success is being able to understand development at a lower-level. Learning new languages, frameworks and building side projects helps me through the low periods and enables me to work more fluently with developers.
I have experience with Javascript and VueJS from a couple of years ago, so my goal is to catch up with modern JS (ES6+), brush up my JS core knowledge (not just frameworks) and learn ReactJS. It's very likely that I won't finish everything on my list this month, due to other obligations, but that's ok. I'm not competing with the experts out there, I just want to learn new skills and build things that I couldn't before. I also have a bit more time now that I'm stuck at home on evenings and weekends.