An important thing for you to be able to dribble the ball as far as possible is to understand the rules of the game. Balance the ball when moving through the slopes and make sure not to collect diamonds on the slopes.
You have unlimited training times in the slope game online.
Avoid the red blocks. They will make you lose the game instantly. Try to stay on the green or blue platforms as much as possible.
Collect the yellow diamonds. They will increase your score and unlock new balls and skins. You can also use them to buy power-ups that can help you survive longer.