Work with your non-dominant hand. If you are usually right-handed use your left, if you are left-handed use your right. If you are ambidextrous use your nose 😉
I like to say I am ambidextrous because there are so many things I can do with my left hand. I can and do use a fork and a knife with my left hand. I use the computer mouse with my left hand. I type with both hands (I noticed very few people do that anymore). I use the phone with both hands. I do hair, cook, create and bathe with both hands. But when it comes to drawing and writing, it takes me an enormous amount of concentration to do those with my left hand.
I drew this little character from a how-to-draw Manga workbook with my left hand first with pencil and then outlining it with a marker. I added an Afro of course.