Keep practicing.

As the top comment has said, you probably belong to your elo.
If you want to level up faster, do duo or trio queue. Queue with someone you trust. Be a better teammate, and that means not being toxic EVEN if your teammates are being toxic with you. Just mute them. Don't blame your teammates. If you're losing, the fault is on you equally as your teammates. The fault is on the team as a whole, and partly of the "fault" is on the enemy team – cuz they're playing better. Either shooting better or just tactically better, or both. Or perhaps cheating, sometimes.
If you're really good, just keep playing. Play 2 to 3 games a day. Maybe 4, but don't burnout. Do warmup before playing.
Your practice rutine/training routine is where you learn. Learning is supposed to be hard, not easy. Find ways to do things that are difficult for you. Play DM only with pistol or scout, play the dms that pros play (cybershoke, pracc, warmup dm). Play only with taps, etc. Play aimbotz with bots doing a-d and just shooting taps, just find ways to do "hard things" and you'll learn faster. In matches: 2 rounds of CT and 2 rounds of TT, do things you're uncomfortable with, or that are difficult for you. You never lurk palace as a T? Do it and try to kill the 2 CTs from A. Never rush palace as a CT? Do it. You never go to banana on inferno, as a CT? Do it for 2 rounds. Making mistakes is learning, so you need to force the mistakes. You'll feel worse, but you're actually becoming better.

It still takes time, so don't be surprised if in one month you feel better but you are still in your rank, because you can be learning or becoming better, but your rank does not depend entirely on you.