After an unsatisfactory rhinoplasty, it's important to wait an entire year before attempting a revision.  The nose heals by making scar tissue under the skin, and with time that scar starts to soften.  After one year, the scar has softened enough to allow a competent surgeon to risk going back inside to take a look and see what can be done.

If a revision attempt is made too early, even to try for only a small change, the firm scar will block the surgeon's efforts, and further inadvertent damage to the appearance of the nose can result.