If you want to make some save investments, take the top 10 altcoins. These coins are really god and in the market for a long time, and wouldnt dissaper any time soon. In the recent market crash, almost all of the altcoins are now undervalued. It shows that when the market is normalized, all of them will make a good profit. Yet, for a long term hold, i beleive you should focus on consistent altcoins which are in the market and tested for a long time. So, you will reduce the risk.