Try gridwork and lots of bounces, this will make your horse pick up his feet💗 Good luck‼️
Try grids? Also make sure he isn't rushing and has time to lift his legs and think about the jump. Maybe put some fill under the jump to make him really look and think about the jump
Definitely agree with the last two, he could be bored! If you don't want to raise the fences try some exercises that really make him think. Keep him guessing!
probably bored. change it up a bit and make sure your striding is correct. check for pain as well, it may hurt to pick up his feet
Try a ground pole. He also might just be bored try raising the jump.