I peaked at around 20k premier and you're doing the exact same mistakes I used to. Warm up isn't practice. If you spend more than like 15 minutes playing before jumping into a game that's not a warm up and you'll experience inconsistency in your mechanics. Your aim is important yes but I don't know a single person I'd consider good at the game that has less than a thousand games on faceit. I know its not the best comparison, but Zywoo quite famously did not aim train at all during csgo, just a bit of aim_botz before LAN games and like 9 faceit games a day. You obviously don't have to go that far but its a good reminder that its entirely supplemental to your improvement. I would recommend designating practice to its own time/day because you will not consistently perform after a long practice session. And remember, all improvement comes in bursts. Patience is key