Help me convince my wife to switch to Bitcoin?

I want to switch most of our money into BTC, since I think that it'll rise more and we'll be able to retire sooner, but she says it's a scam, and that it could crash. How would I convince her that it is a good idea? She has recently come around and said it might not be a scam, but it still could crash. Would there be any way to know if a crash is coming?

Apologies if this isn't the right sub, but r/BitcoinBeginners seemed mostly like a Q&A thing about how Bitcoin works.