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Copper we run out in 2030 I think, helium before that.
Hording copper is a good idea if you have a lot to spare.
I don't know where you got those notions from, but since a lot of people recycle copper I don't think we're going to run out of it, much less in six years. Helium I have no idea about, but that'd suck for all the kids' birthday parties that depend on balloons. AFAIK there's no substitute for helium.
According to USGS data, since 1950 there has always been, on average, 40 years of copper reserves and over 200 years of resources left.
That is from
https://internationalcopper.org/sustainable-copper/about-copper/cu-demand-long-term-availability/Helium however is of major concern: With production facilities coming online in Qatar and Indonesia we will be good well past 2030 but - we
are running short per
https://www.iflscience.com/is-planet-earth-running-out-of-helium-70630 thankfully many critical uses of it are implementing conservation & are minimizing usage as much as possible but nonetheless this valuable and irreplaceable gas IS running out.