Anyone else have this problem?

When i play normals, I cant even force myself to give a shit whether or not I win or lose. I don't play my best and honestly just don't care. I recently got coaching from this diamond player who said that i could be in a higher elo than i am if i kept trying to climb. Problem is, when i lose a ranked game and i tried my best, ill just end up quitting ranked entirely for a sometimes a full month because i just think it's entirely pointless to try so hard at something and not get anywhere because half the time, my teammates dont really listen when i shot call. Don't get me wrong, i win the vast majority of the games that i play my best champs and shot call accurately. It's just those 1-2 games every day or so that i lose because of something i didnt do and it just tilts me to no end.