To which my grandfather replied: "you had to write like that with a fountain pen"
I've never used a fountain pen, but I gather you have to maintain a fairly constant speed as the pen moves along the paper. If you want that handwriting back, I think you have to get rid of ball-point pens and pencils. Although while pretty handwriting is nice, I'm not convinced its worth the time to learn. (Which isn't to say legible handwriting isn't worth learning)