Long-term investing sounds clear in theory. But how does it hold up when the world feels unstable?

People who believe in long-term investing usually agree on the basics when things are calm.

Ignore the noise, think long term, don’t overtrade, ignore Mr. Market (he won’t be mad at you) and use him if you can.

That all makes sense.

What feels harder nowadays is everything else going on around us.
Politics, global changes, constant headlines, a feeling that the world is shifting in different directions at once. It’s hard to completely separate that from how you think about the future.

For newer investors like many of us, a lot of these ideas are still untested.
We haven’t been through many cycles yet.
We trust the theory, but we haven’t really lived through it working over time.

I’d be interested to hear from people who’ve been investing longer.
What did this feel like during past crashes or periods of big uncertainty?
And how did you cope with it back then?