Although, you don't have to trade solely on indicator expressed constraints of the market bit you can as well give ear to other elements to an analysis as, indicator trading is mostly of a technical aspect. Fundamental analysis can also play a big role
One indicator for trends, an oscillator, a volatility indicator and volume indicator should be more than enough to create a coherent strategy that allows you to make money in the markets.
We cant really deny that there are indicators which would really be that needed for you to read up trend change or situations where you could really able to make yourself to position
whether you would buy or sell basing up on the situation that you are into.You would able to notice out for yourself if you do test single indicator to be used
which analysis wont really be that complete no matter what you do.