Sell everything. Except maybe bitcoin and ethereum, I'll observe first before making a move. What I noticed during the middle of the pandemic is that cash is the king. Inflation may be high but it is also expected that most middle-earning investors withdraw their investments just like what happened a few years ago. Stock values plummeted so badly that it is best to sell first rather than sell it at the bottom. Many real estate, vehicles, and other properties will be sold at a discount. So for me, I'll be ready with my cash and then observe the market before starting to shop. Also, in every situation bad or good there are always opportunities but it is for us to find out.
That should be the opposite way. If the economy collapses, that means dollar is worthless, or lets say it is something smaller and dollar is less valuable and not worthless, that means that bitcoin will be worth more. So, if you sell everything during a crash in the market, you are doing the wrong thing. Remember, the worse our economy does, the better bitcoin will do, it is just simple mathematics.
If there is no money, and that is why nobody is buying bitcoin, that would be different case, that is not crash, that is recession and that is fine, we can handle that, it is not a collapse. 2008 for example was a similar thing, markets went down and nobody had money, and what did government do? Print more, and make dollar less valuable, which would have been great for bitcoin.