Personally, I think the most logical approach is to be completely realistic about it. Riot is a company operating under capitalism. Their main concern is money... profit. Its what any company cares about... the "bottom line" as they say. So, since people were leaving their game due to toxic players harassing and insulting them, Riot implemented these rules. Theyre trying to save their playerbase to maximize profit. Dont take it as a matter of morality.
You simply fucked up by not taking their rules seriously. You may or may not have known them to begin with. If you didnt know about them, I would feel disappointed that I didnt even bother knowing the rules of a game I enjoy. So improve on that in the future. Its all about not repeating mistakes. Thats life. Learning from mistakes.
Perhaps you already knew the rules, and should ask yourself honestly, why did I intentionally break the rules? The answer is important, and if youre not completely honest with yourself about it, youre destined to repeat your mistakes and learn nothing.
So really, its a lot of introspective thought that I cant delve into completely since I am not you. But bottom line is, its just a video game that banned you because of some rules that help them profit. You interfered with that. So yeah, in your day to day life, being banned might suck. But dont be too hard on yourself. Its not like you are some piece of shit thats so terrible you got banned from a game. Dont take it as a moral lesson. You just interfered with their means of gaining profit. So make sure you learn the rules next time you plan on playing an online game, and adhere to them, for your own good.
Anyways, time heals these emotional wounds. I fell into a bad depression about 6 years ago after being cheated on by a gf i lived with for 4 years. So i may have little sympathy for your video game ban sadness, but I still know the feeling of depression and losing something I cared about. It will be hard and you will run circles in your mind thinking about it, but slowly every day will get better. One day you wont think about it once all day. Then eventually you'll go a week without thinking about it. Theres no cheat sheet for this kind of shit. You just have to live with it.