What is the best and fastest way to cure frozen shoulder?

Runs its course.....: Adhesive capsulitis (frozen shoulder) runs its course through a "freeze-thaw" sequence. It does get better over time, but it can last over a year. It is painful and can impact your sleep. You can try measures like anti-inflammatory over-the-counter meds, heat/cold, physical therapy. If you can't wait this out, you might want to ask your orthopedist about shoulder manipulation under anesthesia.

Frozen shoulder: There typically there is no quick fix. Often times the shoulder needs to run its course (which can take months). I have seen people benefit from cortisone injection into the glenohumeral joint in clinic. I have also found stretching the shoulder to the point of pain but not through pain with heat before and ice after can help minimize inflammation and post activity swelling/discomfort.