Ask HN: How to get myself into startup thinking mode?

After spending a couple of years working in big tech, I have developed a habit of thinking it through. Hence, I think about software dev as just 20-30 percent of the solution, while worrying equally about CI/CD, testing, security, logging, operations and much more.

I am now unable to develop something hacky/dirty prototype style stuff to see and experiment. Even bad indentation bothers me. I want to do weekend projects just for the fun of it but I can't. Is there a way to out here?