I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better.I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.
What literature needs most to tell and investigate today are humanity's basic fears: the fear of being left outside, and the fear of counting for nothing, and the feelings of worthlessness that come with such fears.