The question is too broad.

If we get another covid-scale disease, lockdown, closed borders, a year's wait for vaccination, etc., with similar risks to life and quality of life?

Then life goes on as normal, after a brief initial period of just enough people simultaneously choosing to make sure they have the basics for the those basics to no longer be on supermarket shelves.

If Russia rolls through Ukraine, then decides to keep going until it reaches the old Iron Curtain?

Then I'm 170 km on the wrong side of the new border for someone whose entire knowledge of Russian is [da, nyet, vodka, mir, privyet], but they'd probably let me leave.

If an EMP or solar flare destroys the power grid, I don't think there's much I can do; even if I bought some farmland and some oxen to pull a plough without needing to maintain a tractor, my total experience of blacksmithing consists of making some hoops on an activity day at the Weald & Downland Living Museum some time around 1993 when I was about 10.