Here are some steps you can follow to help an autistic child improve their balance and coordination skills:

1. Start with simple activities that focus on one skill at a time, such as standing on one foot or walking in a straight line. Gradually increase the difficulty as the child becomes more comfortable with the activity.
2. Use visual aids and cues to help the child understand and follow instructions. For example, you can use a balance beam or a hopscotch board to help the child practice balance, or you can use a ball or a beanbag to help the child practice throwing and catching.
3. Be patient and encourage the child to keep trying, even if they struggle at first. Praise their efforts and accomplishments, and provide positive feedback and support to help them stay motivated.
4. Consider working with a therapist who has experience working with children with autism. A therapist can provide specialized guidance and support to help the child improve their balance and coordination skills.
5. Make physical activity a regular part of the child’s routine. This can help them develop their physical skills and improve their overall health and well-being.
6. Consider enrolling the child in activities such as swimming, dance, or martial arts, which can help them develop their balance and coordination skills in a fun and engaging way.

Overall, the key to helping an autistic child improve their balance and coordination skills is to provide a supportive and encouraging environment, and to work with the child at their own pace. With patience and persistence, the child can make progress and improve their physical skills over time.