Signal? What signal?
You fail to understand what you are looking at. There are many more VAERS reports in the last two years because nearly the entire population of the U.S. was vaccinated 2 or 3 times. In a normal year, only children are routinely vaccinated, 15 times in a lifetime:
Birth-18 Years Immunization Schedule | CDC
Plus a fraction of the adult population gets influenza shots. In the past two years, there were all of these background shots plus roughly 600 million COVID shots, so the number of reports increased tremendously. Doctors and nurses are legally obligated to report any adverse reaction to any vaccine, even one that is expected and listed on the vaccine insert given to all patients, such as slight fever from the shingles vaccine. The mRNA vaccine adverse reactions are listed on p. 2, here:
https://www.fda.gov/media/151707/download
They occurred at the expected rate. When you give 600 million vaccinations, the expected adverse reactions will occur and will be reported. That alone will greatly increase the number of VAERS reports, even though only a tiny fraction of these adverse reactions were serious. Doctors and nurses were particularly careful to monitor COVID vaccination results, asking patients to wait 30 minutes. They never did that with other vaccination I got, and they did not do that with the flu shots I got subsequently. Nearly all adverse reactions occur within 30 minutes of inoculation, so when you ask the patient to hang around, you catch them all. When you let patients go home, even the ones who experience an adverse reaction seldom bother to tell the doctors or nurses, so the reactions are never reported. Only a small number of VAERS reports are not from doctors or nurses, such as self-reported ones.
The adverse reactions occurred at the rate predicted from the double-blind testing before the vaccine was approved. There is nothing unexpected, surprising or alarming about the surge in VAERS reports. The key thing is that there were fewer serious adverse reactions than other vaccines produce, and no deaths.
This is described in great detail in various authoritative papers. I suggest you review these papers carefully before commenting. See the papers here, for example: