In my case, since my default mode is to be inside my own thoughts, I have to make an extra effort to ‘disconnect’ from ‘me’ and my mental world, to pay attention to my surroundings, including other people.
Then, I pay attention, listen, and make questions, because I know that I don’t grasp certain signs, like certain body language, non literal speech, etc, that also contribute to not seeing what’s in the mind of the person in front of me.
To do that, it’s important that I have a certain peace of mind. In other words, if I’m stressed out, all my good intentions of understanding other people’s minds, go to the gutter.
In a nutshell, to improve my other-people’s-mind vision, I have to be calmed down, listen, pay attention and make questions.
And then, I need to recharge batteries by being alone for a while, because doing that, can leave me tired.