If weaknesses are found play the games that will build the appropriate muscles groups.
Develop directional skills and shape formation through activities that don’t require a pencil so that they are still developing their motor memory skills which will help them later on when they do start to draw and write.
Set up a good writing environment where they are sitting comfortably and without distractions, such as the TV.
Correct poor posture and keep the activity short. One minute of happy drawing is better than no minutes.
Try a few minutes of drawing, then do another activity or game with your child. Make a time scale clear of 3 to 5 minutes for the playtime (use a timer so they can see when they will need to stop) and then go back to the drawing/writing activity. Start with 2 drawing session and then slowly increase the drawing/writing time or/and number of sessions and reduce the play time slots times.
You could try to do a couple of these kinds of sessions at different times during the day.
End the sessions with a fun activity or treat.
This will take time, patience and encouragement, each improvement, no matter how small, needs to be recognised and positively praised.
Remember as your child’s skills develop so does their confidence to try, and their self-esteem, as they succeed where once they felt they failed.