Also, correct me if I am wrong, but aren't they all going to zero of bitcoin goes to zero? I suppose ETH has an ecosystem of related products that might anchor it in a unique way, but I see BTC as the "Dow" or "SP 500" of the crypto world.
there are different use cases.
BTC - digital gold. if ww3 happens and all currency around the world is upended this is probably your best store of wealth. scarcity is the value. The "goes to 0" is off the table now imo. There can/will still be 50%+ corrections for sure though.
ETH and other alts like SOL, ALGO, ADA, etc. as well as the lvl 2 and 3 coins like MATIC, DOT, etc. that sit over lvl 1 coins (mostly ETH) - Web 3.0 and defi. This is the real world "use" case for crypto right now. people talk about "owning" the internet in its first years and what that would be like which is web 3.0. defi is sending, loaning, exchanging free of banks and regulators. A lot of experimentation and a long way to go obviously.
shib, doge, and other shitcoins - run up the price real big and hope you get in and out at the right time. the real lottery ticket. there's no long term use case for these other than that. but it's fun.
Like I've posted before many times I don't know WTF I'm doing and don't understand this stuff at all for the most part but I own some from each bucket above and will continue to.