First Tip
First before you even start reading this guide cl_muteenemyteam 1 is a fantastic command which automutes the other team if get easily tilted by comments such as “gg ez” then this is a must have, also this command won't affect your communication towards them so you will still be able to say GG at the end of the game and they'll be able to see it.

My next tip would be drink Water, I know this sounds stupid but just taking a second breathing and drinking water really helps when stressing out which leads to being Toxic this is a great tip to prevent being Toxic. Dehydration can give you a headache and matching this with the pain of getting awp peaked on cat can really play a part in you being toxic!

My next tip would be get some empathy, I know this sounds silly but seriously last time you played bad did you want some guy shouting down his mic abuse at you making you feel like crap, it's not gonna make anyone play better and it doesn't help the game in anyway just be constructive instead it helps people improve and you can also learn from other peoples mistakes so you won't end up making them! Trust me we all have bad games even pro players!

My final tip sounds stupid but trust me this usually helps, stop playing for a day come back in with a positive mindset and just play relaxed layed back and don’t let things tilt you such as kills or getting team flashed these things happen the sooner you get over these things the better player you become. It's important you have fun with the game and don't take it too seriously because changing as a person just because of a game isn't healthy so make sure you take a set back and understand the concerquences of your actions.

Enjoy CS (and other games) because that's what videogames are for, always remember that!