RTTR
Read - as much as possible, as long it's not sensationalist. It can be other people's opinion, well researched journalism, fiction, expertise related content or just about anything.
Think - Don't read with the intention of finishing. Think as you read. Think about what you read after you have read it. Think about how what you read contradicts/confronts what you know or believe in.
Try - After thinking about, experiment with what you have read. Employ some filter - reading about gaslighting is okay. Don't try it. Try it a few times by adding your own variations to it.
Repeat - start again step 1 on the same topic. Now read differently - broadly, deeply, on the periphery..
You can do this on one topic for your entire life or try a variety of topics to keep life interesting.