First just practice, and ask somebody you know that does have good handwriting, or ask an adult to help you
Mostly it is practice but getting a book on calligraphy and penmanship would help. It is also better use bold letters and leave a finger gap between each words and so the lines. It would make your handwriting to look like fine.
The way you need to alway remember is practice makes perfect!
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Practice,Practice, and more practice. Unfortunately, I have't heard of a quick way to improve your handwriting, but I write all the time and mine is really neat.