I am not an investment experts but what I know is that altcoins investment is not what someone must pick for you, you need to do a deep research about the coins you are interested in and if you finds out that the coins have the potential of doing 10x of your returns on investment, you can go ahead an invest in the coins, it doesn't have to be one to two coins but as many as you can find that has the potential to give big ROI. When you don't do your own research and you take the suggested coins of friends, you have to be ready to bear the risk of losses too.
Investing in altcoins is not like a gold mine. You could win yesterday and lose today so many investors should not see it as a way to make huge profits in the market. There are altcoins you will buy in the market that will give you amazing profit and there are some that will make you cry. This is why we need to be smart and do a lot of research when investing in altcoins that don't have a known team or experienced team that have been known in the crypto market with their influence. We can as well hold different altcoins in the market that have great values.