If you buy and hold 1 Ethereum, you will get a lot of profit at once. Because the price of etherium will increase a lot by 2020. You can also buy and hold some more coins. Such as Bitcoin, DIA, BNB Etc. Because the future of all these coins is much better. If you buy some DIA coins right now, you are sure to get a lot of profit at once. Because now DIA is a very good defi project. So I would say you can buy and hold this coin.