I personally prefer to hold bitcoin and ethereum. They are good coin and more potential to hold for long term.
It is very good to hold bitcoin and ethereum in the long run but you have and more and more also add other coins that have upward potential like BTC and ETH and that can add to your portfolio.
TRX, LINK, LTC, DOGE BAT, BNB will be the best choice for you.
Because a lot of news this year the cryptocurrency market will grow well.
There are many different cryptos having huge potential to have a market value uprise once recovery occur but only few would be good for long term holding. Only those which have generated a huge community of users including demand and volume, would surely be the ideal cryptos to hold. Specifically, big names in this industry as Bitcoin. Holding the new ones would give a bigger risk compared to holding the 'big' ones.