The Cause of Gamer Rage:

Gamer rage is often caused by consciously or subconsciously associating your overall self-worth as a person with your success at the game(s) you play. It can be triggered when you lose, when a game is perceived to be unfair (something about a specific strategy, teammates, etc.), or when any type of progress is lost.

How to Stop Raging At The Final Call of FortCraft Souls:

The main way to do it, while still caring about the game, is to change your mindset on losing. Instead of aiming to win, aim to get better at the games you play. Losing with effort (like while actually trying to win) results in getting better at the game faster than if you had won. With this in mind, try to think of losing as something overall beneficial than a bad thing. Like Sisyphus and the stone type shit

You can also take it less seriously, most "ranked" games are just casual esports and don't actually reward you with anything than a really cool number or rank. In casual, there's even more of an excuse to not take it seriously since it's casual. While playing a video game, your main goal is to ultimately have fun. Trying as hard as possible to be good at the game you play should also be part of that fun, I also like getting better at games and trying super hard to win because its fun. Actual esports is a whole other thing though.

Quitting the Game When It Sucks Αss:

Sometimes, the game itself is the problem is just really bad or just not your thing. Bad moderation, bad game design, personal preference, etc., can trigger rage. Instead of responding to it with rage, while its ok to be a little irritated/angered by it, you should just stop playing the game. At this point, when the game itself isn't fun and the main goal is to have fun, you should begin to play it less or not at all. Try not to become too frustrated when a game is like this, there are many other great games you can play instead.