I can only second it so many times!! I can't say i made SO many mistakes in my career, but i have left my then utterly dead-end first job too late, in 2007 while things were abundantly clear about it by 2005 already and i wasted two extremely frustrating years trying to keep it afloat. Lives of everyone who stayed were ever more destroyed than mine was.

I was young, and was making more than literally every single person i knew, i bought an apartment in a year in cash. I thought it was once-in-a-lifetime job which will never happen to me again.