You are trying to time the market. That is notoriously difficult. You are almost for sure going to miss the ideal timing. That's why there's the saying, "time in the market beats timing the market". There's many write-ups on this topic, but https://www.schwab.com/learn/story/does-market-timing-work shows a decent breakdown of different strategies and how they would have worked out.
> You start missing house payments, soon homes start getting foreclosed on, the boom we've built in construction starts to burst, and we have 2008 all over again
A few things here:
1. We have less building now than during the lead up to 08: https://tradingeconomics.com/united-states/housing-starts
2. Subprime mortgages are dramatically lower in volume
3. ARM loans are dramatically lower in volume
Just because there might be an increase in defaults doesn't mean we're going to see anything like 08.