@webiondev, I have to believe that the main priority is the health of your transplanted liver. Do you agree?
After my liver and kidney transplant I was prescribed prednisone and I wanted to get off of it because I, too, feared the side effects. My doctors explained to me that even with the potential risks, prednisone is a drug that works. My doctors based their decision for keeping me on prednisone (low dose) for many years, on their (Mayo) research which showed that in my situation it was the best for me. I took it for around 5 years.
I would like to share discussion with you. I invite you to post your concerns about prednisone. - Prednisone good and bad.
https://connect.mayoclinic.org/discussion/prednisone-good-and-bad/
Here is a link about Prednisone. In it I found some information that might be interesting to you. I encourage you to read it all. Here is part of what I read:t
"Prednisone provides relief for inflamed areas of the body. It is used to treat a number of different conditions, such as inflammation (swelling)....Prednisone is a corticosteroid (cortisone-like medicine or steroid). It works on the immune system to help relieve swelling, redness, itching, and allergic reactions."
"If you will be taking this medicine for a long time, it is very important that your doctor check you at regular visits for any unwanted effects that may be caused by this medicine. Blood or urine tests may be needed to check for unwanted effects."
https://www.mayoclinic.org/drugs-supplements/prednisone-oral-route/description/drg-20075269
Have you asked the doctor "Why?" he wants you to continue at this dosage? Has he given you any suggestions for the side effects that you find bothersome?