Saved up 1 million for a house we are no longer buying, now investing it into the market

We were planning to buy a home, but for a variety of reasons, we no longer are (probably not in the next 5 years), so that money is just sitting in a money market, and we are now planning to invest it. The last time I did a single large deposit into the market was around 2022, and within a few months the market took a downturn and it was painful to see it take several years for that money to return to the original investment value so now I am scared. In addition to that experience, I feel like I keep hearing there will be an AI bubble burst and downturn in the market. What would you all recommend? Invest 1 million now all at once or slowly? Are there funds you recommend investing in to avoid this AI bubble burst?