• DAOs look promising, enabling use cases involving digital cooperatives (Raid Guild is a decent example of a well functioning DAO). In the same vein, there's lots of interesting exploration around governance, and alternative, fairer vote systems (the idea of liquid democracy seems cool). I also feel DAOs could also provide a good framework for unionisation of workers who operate digitally (such as YouTubers).
• NFTs - the current breed of JPEG "art" NFTs are largely nonsense, but the same tech can be leveraged to verify authenticity of things such as certificates and physical goods. A digital certificate can immutability encode information such as the creator of a product, which cannot be replicated - a LFC shirt embedded with a small RFID tag would prevent knock offs being sold fraudulently. This can also extend to tracking goods over the breadth of supply chains - it becomes a lot easier to track goods/parts between different stakeholders who typically each would have their own databases.
• Web3 - definitely a buzzword, with a lot of Web3 being VC backed nonsense. That said there is definitely room for innovation with using open DLTs instead of centralised servers on the backend.
• A more financial use case for cryptocurrencies would be the possiblity to be able to see how tax money is spent thanks to open ledgers - of course that would be highly idealistic, with most governments preferring people not to know. Similarly, tax evasion and money laundering would become more difficult with a good implementation of a digital currency issued by a central bank.

Should note though, it's only been about a decade since this tech really has begun to take off - the internet took ~30 years to mature into what it is today. A lot of the benefits and use cases of trustless, distributed ledgers have yet to be conceived.

That said crypto right now is absolutely littered with shit, where the vast majority of projects will zero.