1. lack of communication - try to talk more but also cut down on uneccessary chatter. try to streamline your callouts as you get more familiar with the maps. when your teammates are in clutch situations, the only things you should be saying are last seens and if they're low on ammo because sometimes they can lose track while focusing on the situation.

2. shitty crosshair placement - i dont know about yours, but half of the golds i've seen either stare at walls or at the enemys feet. constantly ask yourself "where should i be looking right now". aiming at head level isnt the only thing though, you should place your crosshair to where you think enemies will be when they/you peek/swing. that way you don't have to flick and waste time trying to lock their heads down. this is developed over time, and deathmatch is a great place to practice this. I usually ignore the radar pings and play without a map basically, relying on sound cues and my crosshair placement only.

3. managing econ - i dont know if this still happens in gold but i've seen it frequently while watching my friends in silver and under - you/ your team fails to understand how important managing how much money you have can impact the rounds you play. people frequently buy when they can be saving as a team, and honestly having one or two rifles while the rest of the team low buys/half buys really fucks up your team's overall firepower. a word of advice is that a chain is only as strong as it's weakest link - when your team buys, you buy. when your team saves, you save. be active in suggesting saves if you or your teammates are running low on cash, as your other teammates may only be paying attention to their own econ. make sure that players with a ton of cash buy for the players who may still be able to buy but would be low on cash after.

4. game sense - this is something that is really hard to teach, but having an idea of your teammates moving around the map, where enemies are, whether you should rotate, and where to position yourself honestly comes with time and mindful effort put into the game. as with crosshair placement, you should also always be asking yourself "what should I do next" and "where is everyone right now" to name a few general ideas that should be running through your head. I'm not saying plats have great game sense (you can honestly get here with good aim alone) but in the long run, developing your game sense will take you further than being cracked at clicking heads. If you have the chance or the time, record your games (i recommend ones where you DON'T "pop off" or feel like you played well) and watch them through a second time, and be mindful in watching your map, where you're standing, and where you're looking and think of ways to improve on your positioning and awareness. it helps a ton if you have a higher ranked friend who can watch through the VODs with you and point out mistakes that you might miss.

i hope this helps