During the period the exchange rate of cryptos decreases, if you are investing in Bitcoin and ETH then hold and wait until the exchange rate increases again. If you hold the other altcoins, then the advice is to exchange from altcoins to USDT and keep until the market rebounds back in March. At these dip times, you need to calm and resolve.
That is what I am doing. I hold all the coins I mined at present. I think the price could double or triple in 12 months.