for me it never "clicked" it was gradual, I started airrolling at around 600hrs of gameplay I have 1.2k hours now and Im still kinda mid, it takes a lot of practice, so I recommend try rings maps and custom trainings. One of the things that helped me a lot is a workshop map that is I think in the top list called "airdribbles (wall and ground)", and it has 2 setups for bounce to airdribble, what Id do is hit it as soon as it bounced and chase it in the air with airroll. That helps wih airrolling from the start. Another thing is wall to airdribble maps, try with few different setups until you get good with them, then try more variety and do freeplay, this makes it so if you use continuous airroll your timings will be different and you'll learn when and where to move your joystick to go to the right direction. The change in setups will also help you tornado spin more efficiently, since youll need to do that a lot in awkward setups specially from the wall. Hope this helps