The price of altcoins depends to much on the price of Bitcoin. When bitcoin falls all altcoins falls too.
But a lot of depends how useful is the coin and about it demand in future.
Thanks blockchain it is possible to invest money in nature protection like this
https://twitter.com/ClimeToken/status/1498942071658405888Now many people think that cryptocurrency market will continue to rise. They hope that rise will be soon and buy cryptocurrency for investment purposes just to hold it.
The economic situation in the world is unstable and the adoption of bitcoin increase. After bitcoin increase the popularity and demand in other altcoins.