If you want to climb, don't play on weekends, right at the beginning of the season, right at the end, or right after school is out for the children
Casuals ruin the game from all angles, poor matchmaking balance because nothing can balance players with 100% random levels of effort put it, who easily tilt each game, focus is on skins and shorter games now, if you know someone who barely plays but has a lot of opinions, thank them for the state of the current game, and ultimately when it dies.
and don't waste your time on the people who look at end game stats and say "well you lost in your role" almost all of my losses on my cursed smurf start with me crushing lane then the enemy slowly camping me and 4-5 manning my lane until my kda is not great, and my lead is lost, if they're not going through the minute by minute stats and actually taking time to see what really happened, then they're just a low effort troll