A lot of the time "normal" is an ableist concept, and the solutions provided are basically just to "mask harder".
I think a more actionable thing people can work on to be "normal" is to seek emotional regulation. Anyone can work to get their emotions, especially anger, under control. Very few people are actually normal by this definition, of course. People are angry as fuck, and my solution to this has just been to care less and be more patient.
People get mad when driving for example, especially because the person in front of them isn't speeding as much as they'd like. Care less about how quickly you arrive at your destination. Care less about the mistakes other drivers make. We will all get there when we get there, and that's okay.
There are things outside of our control, and what we can control is how we react to things. To some degree, a big solution to stress is to just not stress about things. That seems unhelpful, but the point is to change one's mindset and to avoid dwelling on inconveniences.
Of course, people also get angry in the face of injustice. That's a whole other thing, and I think people should actually focus all of their anger on this.