Anyone who tests positive should isolate for 5 days, even if you are not experiencing any symptoms, regardless of vaccination status per the CDC. Fully vaccinated people can still contract COVID-19, although such break-through infections are very rare. You are also strongly encouraged to share your test results with those you believe you were in close contact with so they may take appropriate measure to isolate.
There may be treatments available for some individuals with COVID-19. Please see this link for further information on the CDC website.