IMO the best framework to look at cryptocurrencies from a high level is to put them into two buckets. There's BTC and then everything else. Here's why. BTC has already won the store of value, monetary network race. It has been attacked through multiple vectors over a decade and has only gotten stronger over time. It's been bought for that purpose by multiple companies and one sovereign nation (although soon there will be others). It's by far the most decentralized of all of them. You also say oh they'll just make a new bitcoin but that has already been tried and failed spectacularly. It's just very unlikely to be displaced in this segment of the industry.
The rest of the coins have a myriad of proposed uses, but most of the biggest ones are smart contract platforms. They're pursuing innovation in different directions whether it be NFTs or lending or whatever. They're much more centralized in who holds the coins, who makes the rules, and who's building on the platforms. It's just much more of silicon valley VC mindset behind it all. Some may be wildly successful, but their addressable market is still smaller than bitcoin.
Its value continues to go up year after year.