Bitcoin is the king and when the king sneezes, everyone shivers. When bitcoin is in the bear lane, other coins (altcoins) follow and vice versa.
That is why myself and many other people do not believe in diversification in cryptocurrency. You cannot hold bitcoin and want to diversify in altcoins. It is the same risk and even worse risk.
If you invest in bitcoin or altcoin then diversify to gold, Real Estate etc.
Again, Op I do not think you want to invest in a stable altcoin (USDT). It will not give you RoI.
I agree with you that Bitcoin is the king of all cryptocurrency markets,but one thing I have noticed,That when the price of bitcoin falls, if bitcoin falls 10 percent, all altcoins fall 20 to 25 percent,And this is beyond my understanding
Diversification is an excellent strategy in cryptocurrency.This is how you divide your capital into different cryptocurrencies.People adopt this method to protect their assets from loss,because investing in a single coins is risky.If a project fails, all your capital can be lost.
The advantage of investing in different cryptocurrencies is that if unfortunately one of the coins goes to zero, the rest of your capital is protected,And if one or two of the remaining crypto-currencies increase in value, then your loss will be covered and your profit will also be made.