It's very easy to forget that things could have happened differently: COVID hysteria could have been around for many years, crypto currencies could have become a major player in the world's economics, the Germans could have won...
One way to appreciate this fact is to try and predict the near future. Which of the current "hot" trends will fizzle out into (rightful) nothingness, and which will change the world? Area such as A(g)I, Quantum Computing, Self driving Cars, VR/AR/metaverse, Nuclear Fisson, Carbon Capture, etc etc.
And what percentage of your portfolio are you willing to bet on it?