What I’ve been doing lately is trying to play ball 1 and 2 like I’m going for the grand champion score. If that doesn’t work out from an errant shot or something, I practice specific shots and skills for ball 3 and any other extra balls I get.
Example would be I just try and hit as many back to back ramp shots or loops I can make on Maiden until I drain. Or I’ll see how many times I can pass the ball back and forth on the flippers etc.