While the market crashes further from 300 billion USD to 200 billion (+1.7 billin Telegram token), you can panic sell, try to beat the market, or HODL and work, study and sooth your nerves with information that strengthens your resolve that there is intrinsic value in the world of cryptoassets. One great place to find those resources, is from Coin Metrics. Their list of resources is so good, you can probably spend weeks going through it all.
While you are at it you should also take a look at the coin metrics tools, if you can make sense of them.