You can only carry the weight of losses for so long

I think the whole "focus on what you could've done better" argument for improving your win to loss ratio is getting redundant. There are simply way too many things out of your personal control to say "this loss could've been averted if I had done better or been more positive". Sometimes people have bad games, sometimes people are just outclassed, sometimes people get counter picked or play against their champion's counter, and more often than not a lot of this misfortune occurs on your side of the field.