Valuations at all time high..

I look at the market today as a 27 year old. What the hell should I be investing in. I have the ETFs in my retirement. Brokerage wise. Everything is so expensive you’re either chasing AI & tech or looking for value investments and tbh they’re all so damn expensive to buy into. I fear that Gen Z will end up being exit liquidity or bag holding. Thoughts?? Opinions?? Advice?? I’m in the stage of paying debts off and will have them paid off this year before investing so for my particular scenario I won’t be fully investing long term in a brokerage until probably the end of the year.