How do i stop being toxic?

I've gotten a 14 day suspension as of recently, and have found myself being toxic as of recent matches. I dont know how to stop being toxic or stop flaming my team. I've tried mute all but i also thought that i would ignore the nice people who are in league too. I also love to use the chat, to say good and bad stuff. I have a bad environment at my house so i play league to relieve my stress although i already enter games stressed out so when people feed/ or do something wrong, i tell them to keep trying but get mad at them when they dont want to try. I want to reform but its just so hard. Should i take a break, or should i just mute all? Any methods on how to avoid being toxic, and if so i would please like to know.

Thanks for reading my post, feel free to offer any advice available !