One of the main things is reading new business books. The first book I’ve read since I marked my 2020 resolutions is “Responsibility in manager work” by V. Zhandarov. You can see the cover of the book near my description.
From my point of view, the book is easy to understand but the author describes all material crude and obscure, with a lot of stupid and rude comments.
I have not recommended that book for reading, totally, but my bosses were glad to read that book, what the surprise for me!
Anyway, I keep reading new books!