I don't think there was a time altcoins perform more than BTC or maybe I have not discover decentralized currency, because since I involved myself in decentralized currency, whenever BTC is pumping in the market altcoins price will be pumping, and whenever the price of BTC is dumping, altcoins price will be dumping to prove that BTC is the king among altcoins.

It looks like you've invented a new concept - a decentralized currency.
As for altcoins, here is a simple example:
SOMM
If you had bought it two months ago, you would now have a profit of 140%

Now the question is, can you make that kind of profit with Bitcoin within three months?
Does it mean that decentralized projects do not crash? I know these project have done well in the past months with high turnout than Bitcoin but I know that this is still risky for me because their is not way I could know if their performances can be as impressive as this.
You know more than I do, you have experience more than I do when selecting good altcoins but most time I get scared of some of these projects when memecoins or DeFi because their lifespan are never visible to the public. I could check the market, observe the price and buy and the next minutes, the price might crumble.
Maybe not for decentralized projects though. Do you have any pattern you use to select good and promising altcoins? Your feedback will be respected and appreciated! Thank you.