If your pet hedgehog only eats mealworms, the following may be helpful:

1. Make sure your hedgehog gets enough nutrition: Mealworms are a favorite of hedgehogs though food, but they do not provide all the nutrients a hedgehog needs. Therefore, you need to ensure that your hedgehog is also getting other suitable foods such as fruits and vegetables.

2. Gradually change its diet: If your hedgehog only eats mealworms, gradually changing its diet may be a good idea. You can start by mixing some other foods together and gradually increase the proportion until the hedgehog accepts other foods as its main diet.

3. Provide plenty of water: Mealworms need to be kept moist to avoid dehydration. So making sure your hedgehog has plenty of water may help it start accepting other foods.

4. Try different foods: If your hedgehog only eats mealworms, you can try offering other similar foods such as other insects, fruits, vegetables, etc. Hedgehogs may accept different foods, especially those that resemble mealworms in taste and shape.

If your hedgehog still only eats mealworms and develops malnutrition or other health problems, consult your veterinarian for more detailed advice.