Basically, if you want to become a good writer, you need to do three things. Read a lot, listen well and deeply, and write a lot.
That's true. Greatness is usually born more out of hard work than raw talent. My clunky (but still true) advertising version goes like this:
Basically, if you want to become a good concepter, you need to do three things. Look at ads a lot (especially the annuals, and especially early in your career), observe well and deeply, and practice your craft a lot.