Well bru with the new patches incoming and the new changes late game wins, so i know it feels bad to be demoted but sometimes is better so u learn and update urselfto the new changes, if u deserve it u will climb back or if u got better u will climb further. Dont forget to have fun no matter how competitive you play the game. My advice just play safe, for late game, let your team to get items and always rotate smarter better and faster than enemy team. Map pressuer and map control wins for sure. You as main support warding dewarding and preparing objectives plus securing ur team mates to stay alive, this can win games easaly.