Voice rest and vocal rehabilitation help to some extent. But ultimate treatment is surgery only

What profession are you into, and do you have the habit of screaming or using loud voice or excessive speaking,, vocal polyps usually need resection but voice rest, hydration helps to a little extent, plz share images if any and consult for further discussion Avoid all cold sour sweet foods, keep hydrated, do not take heavy meal at night

Unfortunately for a vocal polyp no home remedies can help. Avoid straining your voice. Consume 2-3 litres of water per day. Surgery is the only solution to a vocal polyp.