I think the truth is that I was heavily influenced by e.g. sites like HN, where it's always touted as the ultimate virtues to have these side-gigs and basically be working all the time. When I looked around though I realized that this is just not the reality for the overwhelming majority of people. Most people are happy just working their 8 hours and then _do something else_
So, my advice would be to 'stop trying so hard'