I posted the same thing for Plan B🟠 a few days ago, but it's also interesting for Plan A:

What would have happened over the last few years if you had simply held an S&P500 ETF for e.g. $CSPX (+0.97%) for example, if you had simply held an S&P500 ETF for 4 years from any point in time instead of worrying about the optimal times for entry and exit?

Here are the price movements with 4-year intervals on a logarithmic scale:

Here is the performance that would have been achieved over 4 years: