Long-term investment, of course, we will keep the coin for a long time, and the coin of our choice must really be a safe coin and will not die. 
These coins are the top coins on the Coinmarketcap list that I chose, Bitcoin, Ethereum and BNB are the most viable Cryptocurrency coins, and Safe to invest in the long term. 
And what needs to be noted, these three coins have a potential value that is priced in the future.