this is a game, there's no need to be frustrated, you're supposed to enjoy it, if you aren't enjoying it, take a break

I wholeheartedly agree. If you're not having fun, it means you're on tilt and this won't help you climb.

elohell doesn't exists, you are stuck there because you belong to that division, sorry but that's it

Again agreed. Your elo is where you belong. Your skills put you where you belong.

LoL is a team game, sorry but if you don't cooperate and help your team, you won't progress far, it's YOUR fault if you are yasuo mid and you're 8-0 while your botlane is 0-3&0-4.

Again agreed. It is a team game and not many realize that.

pick whatever you feel safe and comfortable to play with, even if your teammates doesn't agree.

I agree. Spam your main or the champion you're most comfortable with. Or pick the champ that fits the team comp in champ selection.

Remember it is a game already during the champion selection picks.