Keep a “decision“ journal. Write down your reasons for your choices. Make predictions and observe the results. Revisit weekly.
I did this and it helped me enormously. Not only understanding actions/outcomes of myself and others but also flaws I had in tons of my own mental models and behaviors.
I would also recommend listening to the „You are not so smart“ and „beat your genes“ podcasts. Both will reference papers and books that provide further reading materials.
As far as books go, I got a lot from Nassim Talebs work and the great mental models series.