Cardano is one of the most valuable currencies to invest, it has great potential. Cardano has a professional team, Cardano's scalability is also good. Cardano fixes many bugs on Ethereum, which suggests that Cardano is very promising, in the future it may become a rival to Ethereum. However, I advise you not to sell all the ETH that you are holding to invest in only Cardano. Ethereum is the queen of the market, you should hold Ethereum for future profit.