How long do you trade? What are your key pointers when choosing a coin to invest in?

If your experience tells you that those coins are worth putting some investment in, then go ahead and see the result for yourselves. We might have the same portfolio but our approach will be different, hence with different results.

But if you are just a newbie, I suggest limiting the diversification for now and have a test for only 2-3 coins including Bitcoin. However, if you think you are ready and prepared to monitor several coins at the same time, then it's up to you to push it.