Help me understand the value of Bitcoin

So I have a bunch of friends into crypto and they've made really good money. I missed the boat. From a pump and dump perspective I get it but outside that I just don't understand the monetary value in bitcoin. Help me understand so I can jump on board too!

So basically I understand all the positive attributes ans what is it used for / developed for. What I don't get is the value tied to the price of bitcoin. I understand it's limited but say the price of bitcoin gets pushed by hype to 100k USD, why do I need to pay 100k for it when I can use another coin or fiat currency to buy something? The dollar may collapse and BRICS may come into play or Russia's new gold backed cryptocurrency. Why can't I/ people use that to buy something and why should I spend 100k USD on a bitcoin? And like all technologies, there might be a bitcoin 2.0 that's much better so people will just use that instead of wanting bitcoin for 100k usd.

This is what I don't understand and why I don't see any monetary value in it besides a pump and dump to make $$$. Which if that is what everyone is using it for I get it. Even at it's current price I don't get why I should spend 25k on it when I can do everything I need to without it.

Thanks!