Frozen shoulder management methods

I was diagnosed with frozen shoulder after visiting the hospital due to right shoulder pain.

After receiving an injection for pain around my shoulder and neck, my symptoms improved significantly, but after some time, the pain in my right arm has returned, and I can't fully extend my arm. My arm also hurts during sleep and brief rest, causing frequent pain complaints. I wonder if I should go back to the hospital and get another pain injection in this case.

My acquaintances around me suggest going to the bathhouse and frequently stretching your arms in the hot water. Does that really have any effect?

I am also doing stretching using a rope at home.

Since I frequently experience pain in my right arm, I feel that my quality of life temporarily decreases.