What would you do after reaching this cycle top?

My plan is to buy U.S. dividend stocks. Before adjusting my portfolio, I should learn and study stocks and the U.S. stock market history. This chart is the history of S&P 500. It's like a navigator telling us where we're going.

I think before investing any assets, we need to check the entire history. Then, we can see a forest. To be honest, I'm still a beginner of the stock market. However, if I don't know which cycle I'm on, I'll fail. In this chart, It seems like the secular bullish market will last more than 3~4 years. The main reason could be the AI(Artificial Intelligence) industry. Anyways, it's likely more promising than the crypto market in 2020s.