The US GDP is 18.57 Trillion... to grow that at 3-5% sustainably would be impossible. The law of large numbers takes hold at some point, and the world doesn't work like a video game.
Good news is, here is an article from fortune interviewing Warren Buffet explaining why it is not necessary to do so while still maintaining a growing and prospering society.
I'm not going to google your trough to peak theory, but I do believe that using the bottom of that great cataclysm to infer a major market crash is probably not valid. You should have sold everything long since as the market was rising 18% per year.
I remember those days well and equities were really reviled, people literally thought the economic world was coming to an end, people were selling in to that great cataclysm which is what spawned the term "I lost everything in 2008". Psychology was extremely negative, people were really selling everything and losing their homes. That is no longer the case and now sentiment is quite bullish.
While at some point in the future a crash will happen, unless a concrete timeframe is given nothing can be done with the info.
Either way, good luck to you. I'm jaded because I've heard predictions of a major market crash every week for over twenty years. Literally every week. Somehow, the first stock I bought, RY is up over 1000% since then.