If you want to improve your handwriting, you have to be really determined about it.
I'll tell you a little about myself. When I was really young, I think I was eight years old. I got admitted into a new school. It was a degradation from my previous school (talking about fees). I was happy nonetheless to be in a new school. But not for long.
We were taught Arithmetic and given some class work to do. I hurriedly did mine and submitted as I wanted to make a mark as a very brilliant pupil. I waited for the sum to be marked but what I heard was, "Who owns this fowl-scratch handwriting?" I felt like melting to the floor because everyone had burst into laughter. I felt really bad and couldn't play with the others during recess.
It was from then I made my mind to improve on my writing. Few months later, it just happened that my brother's friend, who attends same school with him asked me to go get something inside their house for her (we lived in the same compound). As I got in, I saw her notebook. My gosh! That was the most beautiful handwriting I had ever seen.
The note was a rough one. I took it and it found its way to my house. I began practicing writing exactly like that from that day. I exhausted many books in doing so.
Also, I began to take writing homeworks seriously (we had a subject called "HANDWRITING" with a workbook where the pupil is expected to re-create what he sees). I would always try my best to do it as accurately as I could.
On holidays, I would finish the remainder of the book that we didn't do in class. I would even collect my classmates own.
Fast forward to when I got to Primary 4. I had the best writing in school and would even get 100 over 100 as total marks (accumulation of tests and examination). I was copying on the board from my lazy teacher's book while my mate looked from the board to copy their notes.
My writing has earned me favors all through my secondary school days. I've gotten used to hearing "You write like a computer!"
All of these happened because I was determined.