Well, try switching thumb to 3 finger claw and then 4 finger claw and see what suits you.
I prefer playing PUBG M because ROS is full of hackers.
If you get good at PUBGM, there is a good reward in cash awaiting you as well.
Here is a video showing 3 finger claw setup and how to play:
https://www.youtube.com/watch?v=3N4hJIwSTJ8https://www.youtube.com/watch?v=VbUpz3B1D4YThis setup is for PUBG but you can tweak it for ROS.
For gaming tips, watch YouTube and see how the pros play. Landing spot, guns, sensitivity, and tweak everything to see what suits you best.
Good Luck!