this is a precious experience for you right here.
next time don't bag hold altcoins taht are in a bubble and will get dumped hard as soon as the whales find an opportunity to exit. try and look for coins that have been getting pumped and invest in those instead of mindlessly holding on tight to certain "names" that are big.
Now the main thing is not to sell coins, because this market correction is temporary and by the beginning of April the market will fully recover and begin to grow