No matter what you do, do never invest in promises. Diversification is the best thing to do. The least must go for gems and low caps. That must the Rule No.1.
Totally agree about your concept of diversification of portfolio. One great way to make sure the security of your assets and in the same time increases the probability of making more money. This is possible only if you think about investing in Bitcoin or ETH for in the long run, these two coins can be of great worth. The data shows that the element of growth is the maximum in Bitcoin and ETH and besides many other factors, I prefer these two on the basis of this reason.
If you see the data, a lot of coins are currently circulating. What is different is how we respond to coins that have prospects and coins that have no prospects. There are thousands of coins currently available and only a few are quite convincing, for me as a benchmark that coins in the top 10 can be used as a reference in choosing coins. I always see the level of popularity because it will really make us comfortable and feel calm in investing. Choose the best among the best because it is the beginning for a profitable investment !!