Talking about the future of Ethereum is of course very interesting, especially now that the price of Ethereum is above $3000,
even though 2 years ago Ethereum was only at a price of $100 to $300, we don't have to predict the technology,
because it has been proven that the blockchain technology they use is very good, but in terms of price, maybe we should just be realistic,
considering Ethereum will switch to PoS maybe maybe the price will move at least $4000 even $5000.
The reason why it moved that high was the fact that not only the market grew exponentially since then (bitcoin was under 10k back in those days as well) but also ETH is used by many many projects at the same time because of its technology as well. Blockchain of ETH is one of the biggest reasons why people still buy it, this makes sure that people do not buy ethereum just to invest, which they still do, but also buy it so that they could use it to pay for stuff.
All through the summer for example, people used ETH to pay for their Axie world as well, everyone played games, earned money and spent ETH which required them to buy ETH first to spend it later. So there are multiple reasons for it.