It's estimated that in 50 years that all the worlds oil will be gone. That's a pretty short time. Is there anything we can start doing now to prepare for this global event? Other than trying to extend the life of oil and making new forms of energy which are great maybe another good starting point might be not to build skyscrapers we don't need or knock down buildings that don't need knocking down and illiminating the hundreds of different kinds of shampoos we use. Start simplifying things gradually over time. Haven't we been aware of this prediction for a while now? Since then I've seen a lot more growth than dialing back.
We'll have stopped using oil as fuel long before then in any case, due to the imperative to arrest climate change. So I don't think we need worry too much about it running out. (Also, you don't mention natural gas, I notice. Anything you can make from oil, you can also in principle make from methane.)
As far as "preparation" goes, surely it hasn't escaped your notice that huge strides are being made in both electricity generation and transport, to move away from relying on fossil fuel? The world is also slowly waking up to the damage from pollution with plastics, which is another major use of oil. So alternatives to that too are coming along.
We should not be complacent, as there's a long way to go, but the direction of travel is already clear and the technical solutions already exist.