Your vaccine is not 100% effective, so others in the community are still a potential threat. If you are immunocompromised, or possibly allergic to the vaccines

Your vaccine is not 100% effective, so others in the community are still a potential threat. If you are immunocompromised, or possibly allergic to the vaccines, then you may not be able to have one. And as mentioned by the other poster, if the virus is still running rampant in the unvaccinated population, new variants may appear which skirt immunity. Vaccination is a group effort, and while it's great that I am largely protected now, it makes a difference that society at large gets vaccinated too.