Does your child hesitate if you asked, "Write the letter c?" or "Write the letter that makes the sound /m/?" If so, they haven't reached automaticity with letter names and sounds. I have students who sit and think about how to form the particular letter I'm asking about. Proper letter formation is important. Maybe try something like this:
https://www.amazon.com/Handwriting-Workbooks-Practice-Copybook-Reusable/dp/B09DG1W4QG/ref=asc_df_B09DG1W4QG/?tag=hyprod-20&linkCode=df0&hvadid=642214339166&hvpos=&hvnetw=g&hvrand=14397973512445564882&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9007862&hvtargid=pla-1552257544715&psc=1&mcid=f6fad220b37234fc9639f814c8a068a3