the first thing to precede a major magma uplift would be the drying up of the geysers, preceded by them whistling steam without any added water due to increases in ground temperature.
Magnitude of earthquakes would increase, not just frequency.
Vegetation would die off in increasing radii around geyser basins and hotspots as temperature increased.
This is just common sense.
These clickbait articles are shit.
When they start closing sections of the park off or close it entirely then you need to be worried if you are living in the previous high-ashfall zones from the last eruption (available with a little digging).
It would be bad for agriculture - that is why having 1-2 years of edibles stored would be smart. But they need to be edibles you EAT, so you rotate the stock.