Short term treatments usually do not work. Effective treatment is usually very long term starting with a higher dose and slowly tapering to a maintenance dose. A second drug that is not prednisone is usually added to provide a controlling med that is better tolerated than pred over the long term. Treating lupus is not like treating an infection. Treatment suppresses a misdirected immune system which will sometimes reset itself over a long period of time and go into remission but you cannot count on that happening.
I would seek a second opinion from an experienced rheumy about your treatment. Never heard that short term treatments work except temporarily. Many of us have been on pred for years.....6 years in my case but will be off soon. Also had IVIG and imuran along the way.
Every patient responds differently to treatment and what works for one might not for another.