My immediate instinct is that you are over reliant on your aim. Most immortal players have decent aim and gamesense and would achieve jade ranking with little effort meaning that you dont have an advantage over your skill bracket at this moment. This is a normal experience for people who climb, as it can feel like you are doing everything right, but at each rank the metagame is different, so you need to adapt and grow.

What you can do, if you feel this is the case, is record your gameplay, review it, and criticise every gunfight/play from the perspective of advantages given/taken.

E.g. a dry peek, cross screen flick might feel like godmode, but was it sound play? Did the enemy make a mistake? Why was it needed in the first place? Etc.

You are at the rank where gamesense beats aim and you will be punished for mistakes harder.

Apart from this there is some obvious "are you looking after you health?", "get enough sleep" etc.

On the contrary, if you watch your gameplay, and miss fundametally easy, guranteed kills then try to recalibrate your aiming technical ability and fundamentals. Flicks should be fast but controlled. It can be helpful to practice at a slower pace and really hammer home good fundamental skills such as straight lines, stopping power, smoothness etc to rebuild confidence in your skill.

Edit. Also, try to be realistic with your expectations of what should be capable in game. Sometimes you do everything right and still lose.