Six months or more between the second and third vaccination is perfectly fine. You were still protected from serious illness, but now you should have several months of sterilizing immunity, that prevents any detectable infection at all. I wouldn't go and make out with a Covid victim, but as long as you stay out of crowded rooms without a mask, you should be very safe.
We're flying electric helicopters on Mars yet you can't turn on your clothes dryer in Texas. That's because scientists are in charge of Mars, and Republicans are in charge of Texas.