Apart from Bitcoin, very few of the altcoins are suitable for long term investment. Check the exchange rate of these altcoins versus Bitcoin and you can see that they have lost most of their value during the last 2-3 years. Only a few have moved in the other direction.
Stablecoins are also available now. QC is a stable currency anchored to the RMB 1:1. Everyone says it is the king of stable coins. ZB now supports USDT/QC spot trading and 10 times leverage trading. After all, it is a stable currency, and the income is still very stable.
I don't know why noobs always have to post their stablecoin BS, in the discussions about investment. Is it that hard to understand the basic definition of stablecoin?