The popular opinion now is buy the coins that are down, and when the market recovers that you'll be in profit. While that saying is correct but that doesn't go for all coins. Don't go buying every coins you see losing value just because you think when the market bounces up, they'll follow. Majority are losing value because people are seeing them for what they truly are which are just a waste of investment and time, also a ticking time bomb waiting to explosed.
The memes you all are rushing to buy today most probably will die with this market and won't be much of a sort after coin when the next bull run comes same goes for the Defi, NFT, launchpad projects you're all rushing to get them cheap not knowing you're buying a waste. Choose wisely, follow up the project. See if their developers are working on something or just hiding behind the now popular saying, the market is unfavorable.
Project with visions uses the bear market to build as they'll be getting less distracted with the whole when moon or when binance question for those not listed there yet. The current market situation present an opportunity to research properly and invest wisely, take notes.
I also think that when the market is down, choose wisely which coin will recover if the market will bounce back. Yes, not all coins will recover because some coins turned into a scam or just had problems with the project so you should research the project before investing not just invest without doing research or you will regret it soon. The top coins are likely to recover, so I recommend investing in the top coins and it's also good for long term investment.