Web3 is largely a marketing term applied to various concepts in the "modern" decentralized web stack that include blockchain, et al.

Crypto is primarily an attempt to decentralize currency by using public non-mutable ledgers (blockchains) where transactions can only be applied (mined) with great difficulty... which kind of precludes doing real-time transactions at the scale of, say, Visa or MC. There are some "investment" currencies that recognize that the entire concept doesn't scale, but again such investments only gain in value as long as you can find someone else willing to pay more for a set of digital bits than you did.

Speaking of which...

NFTs are mostly failed attempts to monetize trading digital signatures indicating ownership of some digital entity. Unfortunately, the entire area was rife with people attempting to sell what they didn't own, or trying to steal what someone else did, to the point where even the major exchanges admitted that most of their transactions were fraudulent and, consequently, many have gone out of business.

I could continue, but I'd just probably get more insults of the kind true-believers throw when someone questions their religious dogmas... ;)

But hey. You do you and hold onto that BTC. I'm sure the price will stop plumeting and it will leave $16K and head back up to $60K any day now.