This question reminded me of the Dr Stone anime. The premise is that a wave turns everyone into marble, several thousands years later a young scientist is unfrozen and uses science to restore society to its former state.

Also, I wonder what the effects of long term exposure to EMP would be to life on earth. Since most neurological systems use electromagnetic waves maybe they are impacted?

Another interesting question would be if there would be a way to work around the EMP. For example, would a Faraday cage work to allow electronics to work inside it? Or maybe electronics are improved to work under the effect of EMP? Like how the CPUs have bit correction algorithms because of random bit flips that occur due to solar flares.

Last but not least, in such a situation my plan would be to go as far away as possible, since there will be food shortages, being in an area where you can forage for food or hunt animals would be a priority. Then, I would probably die eating something poisonous. If I survive long enough to set up a farm, I would probably survive the next 10 years or so until I die of old age at 35 the new average life expectancy.