Esotropia is also known as exotropia. It is a condition where a person's eye turns inward. Here is a simple eye Exercises. Hope it can help you correct Esotropia.
First of all, you shall prepare a pencil. Then, you can try to focus on a single letter written on the side of a pencil while moving the pencil as close to the bridge of your nose as you can while remaining focused on the letter. Then, repeat it. You can just take a few minutes everyday but you shall insist this exercise for long.