Alot of times "up" is a mechanical adjustment, often an imbalance. Sometimes its a mental adjustment.
We tell pitchers to "get the ball down" but when they get it too far down, bad things happen. We bounce the ball, wild pitches, runners move up. Its difficult mentally to visualize some space between "down" and "too far down".
I talk to my pitchers about removing that thought of there being a "too far down". Pitchers do their job, catchers do theirs. We do alot of bouncing the ball off the plate into a net, feeling themselves being down. Now the adjustment is just a little up from that. If you don't know what "down" feels like mentally your aiming for a moving target, so to speak.
I talk about "acceptable misses" and when you are trying to be down, its acceptable to be more down not up in the zone. If I'm trying to be "out" an acceptable miss is more out, not back over the plate. I don't have to execute every pitch, just make sure when I miss its to a location I still have a chance to come back and win the at bat.