USDCHF: If you look at the weekly, and go back a few years, it's evident that when RSI is close to being overbought, it drops, dramatically! I have circled these points.
The key here is to wait until the day/week closes to see where we stand. Very rarely in the past few years has it broke from this region, so this remains a strong resistance.
You can break it down as you go into the lower timeframes, but this is big picture.