Play another game.
Even if you are skilled enough to be ranked at a higher skill level, it is extremely difficult, if not impossible to be expected to solo carry every game.
If that would be possible, this would not be a very good TEAM GAME, or the ranking system severely screwed up when determining your initial placement.
If you truly deserve to climb rank, consistent play will cause your skill to influence the balance of the game in your favor, meaning you are statistically more likely to win more matches and gain LP.
Nearly every YouTuber asked how to climb will almost always insist that keeping a level head and learning not to tilt is the best way to continue to move up.
You WILL lose matches.
Stay calm, leave the loss in the past, and cue up.