For long-term investments, I recommend that bitcoin or ethereum are the best choices because seeing the market prices of these two digital currencies in recent years have experienced significant market price changes, and if you are afraid of losing a lot of your money then I suggest you invest in only gold because it is very certain to get a profit in the future.
Definitely, if you want to simplify your portfolio and get a certain amount of security. But participating in this market in addition to BTC ETH, there are still many attractive things and effectively help increase profits, although then what we hold will still be BTC ETH.
I've also been holding a lot of TRX for a long time, but I'll keep it until I see a need to sell it. In fact, in this field just need to secure the initial amount and get a reasonable profit, it becomes easy to care about other things.