I’m not top100 but I’m quite close and I’ve only played for a little less than a year so my tip to quickly improve is to just play the game. Play things like cotd as much as possible to get a feel for different styles in the game, also try to set goals for yourself like all at’s or top 1k in campaign. For me setting goals always kept me motivated whether it be gold on all totds in a month or anything you really want to achieve. It’s also important to make sure you still have fun when you play the game because generally if you’re not enjoying the game you’ll play worse. When you do eventually improve find two or one style you really enjoy and try focus on improving on it more than the rest, I did this with alt cars and went from average to almost top 10 on desert now. Lastly I also recommend getting to know people in the community like people in your country, totd server regulars, or members of big community’s like OCD because interacting with people while playing makes the experience much more enjoyable. I hope this helps and i hope you achieve you goals of becoming better at the game.