I think this is the simplest but most useful chart that I have for the S&P. No fancy waves or fib levels, just that most basic trend lines, linear regression channel, cRSI, and MACD.
I did add MVWAP indicator, but I have not had a lot of experience with it yet. I wanted something a bit better than the standard 21 day SMA. I set its smoothing to 42 because I am on the 3h timeframe and I wanted a 21 day average.