Good strategy and l prefer also buying any coin at a low price and hold till price increasing, then sell them. Maybe it is the best strategy, but during this time it is so hard to find any coin which can be profitable in the future. For that reason l prefer top altcoins, l think if you can be enough patient you should collect some top altcoins like ETH. That is why top altcoins are great choice for long term investing, it seems price increasing will take a long time.