Dot-com I worked for went down hard. Sysadmin was reading management's email and telling people in advance they were going to get fired. Went from massive office to nothing in just a few months.
Practical advice: save money and live below your means. This will let you survive the next bust, whenever it happens, much better. It will also help you survive a non-systemic layoff, and will help you find better jobs... it's pretty much always a good idea.
https://codewithoutrules.com/2016/08/08/living-below-your-me...