Thanks for that, the report appears to be very recent. However the story does note (at the end) that "how long they will remain effective" is still an outstanding question. And why would the vaccine immunity be longer lasting than the natural immunity from having contracted the virus?
The more time goes on, the more we'll know about these questions. Right now there is just no way to know what happens 1+ year after vaccination, since nobody has been vaccinated this long yet.
If I were you I would see the vaccine as a "booster shot" for whatever natural immunity you may still have, with the expectation that it will improve and prolong your immunity.