What would you recommend reading on a regular basis, besides books?
Since some (online) materials are no so well written -they have many errors-, when I find some good texts in Spanish, they immediately call my attention.
I would like to recommend one of them, which you may follow in Instagram or by visiting its website:
"La Revista Ojo" @revistaojo
Just go to their culture, literature or film sections and skip their political articles about Venezuela if you don't like to read about it.
They write very well. I think reading good quality texts helps in learning a better language.