Just played a game where enemy jett had aimbot and wallhack and got 15 frags in 4 rounds at was blatantly cheating without any intention to hide dashing in to enemies one tapping with ghost and vandal and we had to surrender cause its time...

Basically the title. I tried finding videos about this but nothing is coming up. I'm a plat 1 and I know I'm not good but I really want to improve. Are there any specific parts of my gameplay that I should heavily focus on improving? I m...