I'm global elite and have 1,500 hours in CSGO.
Here are a few tips that I used to improve my gameplay and get better.
1.
Practice Practice Practice
https://fragshack.esea.net/index.php?s=servers
Find the sensitivity settings that you're most comfortable with, most people use 400-500DPI and 1.3-3.5 ingame sense.
Then hop on FFA Deathmatch and seriously aim to get 200-300 kills. Just practice crosshair placement, flicking, spraying and spray control, tapping, etc. Always aim for the head and try to frag out as hard as you can.
Honestly, I have tons of friends who are complete idiots in this game yet are ranked LEM/SMFC solo based on their aim.
I personally try to DM at least 2 map cycles a day, which is around 40-45 minutes of just straight FFA DM to keep my aim and spray control down.
2. Just keep playing
Honestly though, the only way you're going to get better is by playing. Everyone has room to improve, and you're only going to get better by playing. If you feel like you're plateauing, take a break.
Don't touch the game for a day or two, or a week, and then come back. It's all mental. Secondly, if you're putting in the hours and you're trying to actually improve, take a couple of minutes, and go over a couple of your demos. Understand why you died, how you could position yourself better in that situation, what you did wrong, so in the future you can play better.
This is why people watch pro demos. It's to get a second perspective and understand how their game sense works, and try to apply that to your own game.
3. Luck
The shitty part about CS:Joe though is that this game is a lot more random than previous iterations of CS. Sometimes, there's nothing you can do when you're getting jumping p90'd or jumping m4'd , etc. Sometimes your sprays won't hit, sometimes your nades will leave them with 1 HP and you get 1 tapped instead. Sometimes, it seems like no matter what you do, you're always on the receiving end of the frag.
Your best bet is to just keep your chin up and keep on pugging and keep on trying to improve.
Aim for the head, and keep your cool, and you'll find the frags.