Ironically, the most prominent advances have not actually been in cryptocurrencies themselves but rather in the traditional financial institutions that interact with them.

For instance, there are now dozens of products such as cryptocurrency-backed lending via EMV cards or fixed-yield financial instruments based on cryptocurrency staking. Yet if you want to use cryptocurrencies directly the end-user tools haven't appreciably changed for years. Anecdotally, I used the MetaMask wallet software last month and if anything it's worse than it was a few years ago.

Real developments are there, but are much more subtle. Higher-layer blockchains are really popular now when they were rather niche a few years ago - these can increase efficiency but come with their own risks. Also, various zero-knowledge proof technologies that were developed for smart contracts are starting to be used outside of cryptocurrencies too.