I personally have most of my holdings in Gridcoin and Steem power. Mainly because of the social benefits related to their mining. They both have active communities and are resistant to pump and dump activities.

I also buy a large variety of coins through C-Cex, a small quantity at a time, and simply hold them. I do not expect to hold any investment for less than three years.

Many coins simply disappear, it is a bit like buying penny shares. Those that do gain, tend to gain spectacularly. I also avoid frequent analysis of my account, and pay absolutely no attention to the chartists.