What does a career in film (writing, editing, DP) look like or mean long term? What’s the typical career path/trajectory after 5, 10, 20 years?

I hear so much good and bad but don’t really know what a career in film long term would be. What does job stability, income, etc. look like over a full career? How many people going in get personal projects off the ground or take on major creative responsibilities for tv/feature length films during their career?