I would say three things mainly thanks to MMORPGs! (even if other games have some deep concepts that help you explore your own thoughts)
1. Has to be how valuable community is, you don't realize how important that is until you don't have it anymore. There's nothing worse than be an isolated individual in a hostile environment, some times as much as it might begrudge some people, -you- do rely on others. Whether that's the food you're eating because of your farmers, your local store, or just getting help from a friend. Everything is connected and the moment it breaks down, its a disaster. It sounds silly but that's what happened in early MMORPGs, and it really helped put things in to perspective for me. Just as an example it's why the local canditate I always vote for supports local farmers, especially when I see countries corporatizing their food, adulerating it, and even making it toxic. You read a bar of chocolate over here, and it has three ingredients. In the UK which I visit for a friend, it reads like a toxic soup of chemicals.
2. Emotional maturity, when you don't have a lot of life experience (and I'm not saying I do now!) you're often sheltered by your parents from how unpleasant other people can be. This might change with bullying in school but in MMORPGs.. you have experiences that you might not otherwise get, like being scammed, or mistreated, or how it feels to have someone go out of their way to help you even if you just had a massive argument. And obviously, on top of all of that, how you can embarrass yourself by acting silly. It sounds obscene but being social in MMORPGs completely desensitized me to a lot of things. Whether that's differences of political opinion, beliefs, how to empathize, or just people teasing you. Just an example I used to gush over boys all of the time, and kind of let them take advantage of me, I was a simp for other boys that were pretty. I had my heart broken 24/7. And I did the same in MMORPGs until they taught me to stop being stupid!
3. English language, and roleplay! It's really hard to find a local group to play TTRPGs when you're basically living around rural farmers in a small village and fields. It sounds so silly but I remember when they first installed elevators and escalators in a brand new store that had opened in a bigger market town which was my equivalent of a city, it makes me sound ridiculous but you know how freaky that was?! That's how rural it is, even the buildings around here look like mueseum pieces. So MMORPGs allowed me to learn, and do things, I just wouldn't have gotten to do!