If you assume that the stock market in a whole always increases in the long run and you don’t care if you need to wait, I am sure some financial instruments allow to benefit from that. Maybe American call ? For sure, leverage ETF could be an idea. Monthly leverage ETF seems less risky.
The result of an ETF: S&P500 leverage 3x rebalanced every 10 years would be incredible (assuming a reasonable TER )
Also have a look at this article: https://seekingalpha.com/article/3121916-2x-daily-vs-2x-monthly-s-and-p-500-etfs-and-sso-vs-dxslx-updated?page=2