For a secured and sure profit, long term trading/investment on the top major coins in the market will be a very good choice to choose from. In long term trading, the little positive or negative price move is not paid attention until a certain significant set price is attained. Coins like BTC, ETH, BNB etc for the long term, but for the short term trading/investment, any coin can be of good use, so long as it has a good liquidity in the market, and also it is among the trending coins being traded within the exchange.