Any trading system/strategy involves defining the time period for holding, i.e. days, weeks, months, years, etc. I personally would not be day or even swing trading retirement funds. But that would depend on your age, knowledge and abilities. I am also in my 60s, so I went to all cash from very long term (10 to 20 years) stock and bond funds about a year ago. I also “trade” nq futures on a daily basis. Anyway, look at your time frame, let’s say months, and play with different length moving averages and their interaction with each other. The longer the time frame, the less usefulness of macd s, adx , rsi, etc, although if you can find a setting for those that backtest well, you may have a good system. I always used moving averages and held retirement funds for years to decades.