Reply To: I took the 2 shots & 1 booster should i take the next one ?

move on indeed.
You seem to be unaware (as is AAQ if I recall correctly) that pikuach nefesh is not a phrase that means “can be really dangerous, even fatal, to some people”. There are guidelines to determine if something falls under the halacha of being pikuach nefesh and there has been such a crazy misuse of this over the covid years.
You don’t have the option of applying the requirements of how to behave when pikuach nefesh is involved, unless it actually is pikuach nefesh. And by your comments it seems you may not be well versed on these criteria.