potential coins to buy now in my opinion ethereum, xlm, neo and many more when the market is on a downward trend, so we must be ready for stock altcoin and when bitcoin and altcoin go up we are ready to sell.
I think after Bitcoin & ETH there are few more coins like XRP,ADA,XLM, NEO which has the potential in the market and which can help us in earning profit. Investors can go for some investment on these coins since the prices are low and hold the coins for few months you will be benefited for sure..