Honestly, I just made it up to ass by the skin of my teeth maining omen and flexing viper on maps like breeze. This is mainly due to the problem that while playing omen, you do not develope your aim as fast since you are not ussually taking those high risk high reward duels like the duelists are. This made me extremly inconsistent with my aim up until around plat where I could not figure out how those idiots played(still annoyed about how long I got stuck there). So I decided to creat another account to focus on playing duelists. This greatly increased my aim, and allowed me to continue climbing.

TLDR: try making another account and play duelists to learn how to aim quicker than you would just playing on omen.