it's funny. the way that the arguments are made is so ridiculous but so wide spread in 'technical analysis 101' books... author shows an indicator, some kind of line, then a chart, supporting its supposedly usefulness, completely ignore the basic fact that in order to prove something works a much bigger sample size is needed. so people read these books and they present the same way... argue a point, put up a chart, a handful of data points - wala there is your proof..
S/R levels vary according to what time frames you’re modeling. The longer term levels, however, are common and that’s a good thing. So, your question is incomplete and is highly dependent. And as has been intimated earlier - S/R gets invalidated by markets all the time. Guess what would have happened if you shorted Weekly and Monthly resistance levels the past eleven years ?
Maybe selling options, become an insurance salesman playing both sides against the middle. Study statistics and probability.