Well it depends on your capability of having many coins in your portfolio, this is what it means of abundant money investment putting investment in a different coin which do you think will potentially earned that is good for the future.
I think if you browse different user portfolios, almost everyone gets bitcoin and ethereum in it, but based on their research they have other assets.
There are no limits on your portfolio, you can add as many assets as you can. As in the above quote it is up to you, you decide what amount you have to make a perfect portfolio.