The cryptocurrency market is always at risk. However, this is a promising market, if we take risks and invest wisely, we will have a lot of profit. I think we should invest in altcoin in the top 50 coinmarketcap. The altcoin in the top 50 has good value and potential. Some altcoin that I think we should buy now are Ethereum, Stellar, Cardano, Iota and Monero.