Your portfolio should be formed after the research of what you want to buy and in what position the coin is now... If you bought in December-January 2017-2018 now your portfolio is not in the best shape. In the portfolio, it is better to have several well-known coins with growth potential and several coins very promising and young.
Agree with that. I call them the blues chips of crypto - the 10 that got the most trading volume.
80% of the stack and more.
Then 10 to 20% max into some "emerging" coins.
This is exactly the same as stocks.
Long term view, money management and diversification are the keys.