I got the 2-shot Pfizer in mid to early 2021, and a third shot in January 2022. I chose J&J for my booster because I read about a study showing that doing so created a strong antibody response and more importantly, different vaccines produces different kinds of memory B and T cells that might provide broader protection against different variants and strains. Granted, the study was a pre-publication study, which seems to be what we’re doing now… reporting pre-publication studies as if they were the same as peer reviewed and replicated studies…but whatever.
I think I probably WILL NOT get another booster unless/until there is a substantially deadlier variant that emerges. These vaccines have a much heavier effect than the flu vaccine, so I am uninclined to make this just a regular yearly (or 6 month) thing unless the threat level rises.