Jordan Rosenfeld, author of numerous books, including A Writer’s Guide to Persistence, offers the following good advice for writers who want to last over the long haul. (I’ve summarized her advice in my own words.)
Don’t worry about success; just write. The success will take care of itself.
After submitting something, don’t just sit around waiting. Get busy writing on the next project.
Take chances. Who knows? Something you submit at great risk might be accepted and bring great rewards, not the least of which will be publication.
Don’t be a lone wolf. Collaborate on something.
Be willing to say no to some opportunities. The ability to do so indicates that you know your boundaries and standards.
Don’t always do things “by the book.” Risk doing things in unusual ways.
Be passionate about your work. “Plant your own roots of purpose deep in the ground of meaning.”