Some examples of how it has helped me improve:
* Situational awareness and object tracking. Looking at the minimap frequently so I know the last location of each enemy and predicting where they will be moving based on the current state of the match. As a result, I've gotten much better at driving and I feel considerably safer since I can keep track of everything in my surroundings. The car's mirrors are basically your minimap while driving. This same algorithm applies to other real-life situations as well.
* Communication. I've learned how to communicate more effectively to push the team towards victory. It might feel satisfying to insult someone for playing poorly, but that's rarely a winning strategy. Bad players are usually ignorant and they lack a deep understanding of how to play the game. If you provide constructive criticism in a non-hostile or aggressive manner your allies will most often try to integrate that information. Of course, there's all sorts of people, and if someone is unwilling to listen then you just have to play around them as best as possible. Sometimes this means you have to take bad engagement and try to turn things around. This is just learning how to better interact with people.
* Self-awareness and self-responsibility. It's tempting to blame your allies when you make a mistake or a bad call. Sometimes it's definitely their fault, but recognize that you're not perfect and you also make mistakes. Own your failures, don't let your ego get in the way of your growth. Your allies will take your calls more seriously if they see that you're open and honest. Learn to take criticism. Sometimes it's justified and other times it's not, try to integrate the lessons when it's reasonable.
Ever since I started weight training daily I've also experienced improvements in my reaction time, which has had a direct and positive impact on my gaming skills. When I'm hyper-focused on a game, it feels like it's moving in slow-motion and I have way more time to think through each decision.
When I started playing this game I could barely keep track of fights with all of the enemies and spells flying around everywhere. My cursor would frequently get lost in the turmoil and I would just try to spam my abilities into the blob of lights and animations. Now I can largely keep track of each hero, their abilities, and the timings of everything.