Actually, paper orientation was a big help too. Used to tilt the sheet so you write almost bottom-to-top, that way you at least don't smuge the writing right away, and hopefully the ink dries quick enough for the next line
Interested because my son is learning to write and is the only leftie in the family, so I struggle to help him.
______________
/ /
/ Hello /
/ /| /
/ __/ /
/ ( ) /
/ / / /
/ / / /
/ / / /
/____/ /_____/
/ /
The arrow below the o of hello being the pen, and the thing below being my left hand and arm (I actually have fingers IRL, ASCII art is difficult)