The faster the ball spins, the longer you will be able to hold it on your finger, but the harder it will be to balance.
Don’t toss it too hard. You can injure your finger. Some people find it easier to spin the ball on their middle fingers, instead. [12] X Expert Source Ryan TremblayBasketball Coach Expert Interview. 13 November 2020.
Do 3 or 4 slaps at a time, and make sure not to slap too hard. A light, but swift slap should be enough to keep the ball going without disrupting the spin.
Try to find a time every day to practice, even if it’s while you’re watching TV.