I'm a product manager at a tech company. I read. I work on side projects. I learn new programs like Sketch, take classes on Udemy and Coursera, but do not feel like I'm learning as much as I'd like. I'm not learning that much on the job anymore, just adding value to the company.
Update: wow, thanks for all the advice. I'll definitely read through all of it. But beyond advice, I'm also curious what do smart people (like you) do to continue growing in terms of activities.