Thank you for your query at DoctorSpring.com
The right testis has already become atrophic and nothing can be done to bring it back to original size.
However, care needs to be taken that nothing happens to left testis. You should get ultrasound scrotum.
I shall also be interested to know if you had any episode of severe pain in your right testis in the past when it was of normal size.
Feel free to discuss further,