I've been perusing some forums about writing and aside from the writers groups, the OCD's who litter their books with notes and things and those who dissect every syllable two things popped up over and over.
"U R what you eat, literally" one person posted. And it's true I think. If you stick to one genre (not talking about so-called genre novels here, just in general) or only a few authors or even a few types of novels you'll stagnate yourself and eventually begin to emulate and imitate. That's bad. Diversity is the key here, read wide and write wide I say.
The second thing is reading authors who are better than you so you can learn from them. Don't be intimidated, be inspired, don't be embarrassed be emboldened.
Read a lot. Read every day.
Write a lot. Write every day.