Coins that are on the top 10 on marketcap ate the promising coins cause they are consistent on thier place. Bitcoin ,ethereum ,xrp no doubt on these coins cause they are strong.
We can say they are most promising coins in the market today but it is not necessary to have them all for the sake that they are of profitable.
We know how risk in crypto, just be sure that you have enough courage to take the risk and not just losing it when dumps came out.