During the fall of the market many altcoins are very unstable. The most important is to choose altcoins that are useful and brings something new like https://twitter.com/defiroot/status/1531922256779157506 which allows to connect you to Defi in one ecosystem multichain
During the fall of the market many projects will not be able to survive. Now many people simple do not have money for life that is why they sell their assets.
It is very important to evaluate the potential of the project because the fall of the market is the best price for investment.