If there's a big AI bust, there will be no escaping it. Like 2008, the entire economy will slow down. This time it might even end in a war. A well diversified portfolio e.g. index funds will weather the storm and recover.

Build your emergency fund first if you don't have one. 6-12 months of salary in cash or CDs. Then dollar-cost average into well diversified equities. Don't watch them day-to-day. You're concerned about their value in 20-30 years, not tomorrow.