Always be a learner, even if your job doesn’t require it or encourage it. Learn new skills. Learn new concepts and perspectives. It will keep you relevant and valued in your market.
Here are two audiobooks that I'm currently listening to in an effort to grow as a leader and a marketer: (click on the title to preview on Amazon)
Disclosure: I'm a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.