There are definitely some very very interesting ideas in crypto and blockchain.. If you see potential in them, then invest.
Surely you can earn some side money with trading, mining or staking, why not. You can also lose it.
If you want to get rich, remember that you are competing with millions of people, and they have probably better chances to take your money, before you take it from them.
So, if you have some bucks laying around, and you want to invest them into something, but cant afford real estate, then blockchain might be good opportunity. Its kinda like internet in 90's, we don't know where all this is going.. Might be biggest technological inovation, or it can be biggest scam.
I am quite optimistic, and I do own some Ethereum and Chainlink.