But if we know how and smart enough, I believe that our wealth will always increase.
If you sell your bitcoins then only you will see the increase in wealth. It is still not the time that bitcoin is being used everywhere as day to day currency.
Each person will have their own views for holding assets during win-win if the stock market collapses or, more frankly, the economic crisis at its worst. Btc and USD are good, personally I will keep both because I believe and my time in this market shows me that no matter how volatile the market is, I still make a profit.
Talking about market collapse to that extent seems more of a world-ending conspiracy theory and therefore very less likely to happen. What we saw, the pandemic happen and that had its effect on economies and even bitcoin. The current bitcoin price is a different cause though.
Still when a disaster happens, the formal currency will remain fiat. Because with the lack of common resources, electricity will be lost and thus bitcoin will not be accessible. Each of fiat and crypto have their own pros and cons. You have to be diligent and not for the bulltraps set by whales that this is the next big thing, because none are.