I have big, sloppy handwriting, but I'll try my best.
Use a pen with a microfine tip. Use a ruler and line your dialogue area lightly with pencil. Once it's written, erase lines completely with a high-polymer eraser. I use this method when I write letters or cards. I tape the card to a bigger piece of lined engineering paper, which makes it very easy to use a clear plastic ruler and draw evenly spaced lines. Once this is done, I print on the lines and then erase. I like your printing, and I just think you could frame it better.