A day job can be a lot of things. It depends on your perspective. As an artist it is tempting to view it as an obstacle of your success. It takes your time and leaves you too tired for doing your real work. Quitting can be tempting. For a few it works. For most it probably doesn’t.
Apart from the financial aspects, security, stability and freeing your mind from worry of making ends meet. Day jobs also come with colleagues, laughs, coffee breaks, anecdotes, new insights, successes, failures, routines that make you get up in the morning, lunch breaks that you can use for creative challenges or going to the gym. To be honest, I never got that much done in my periods of temporary unemployment.
Quitting your day job might sound like a dream. Yet, you don’t miss your water til your well runs dry.
Or as the Swedish saying goes: You don’t miss the cow until the stall is empty.