What makes price turn around?
A change (a break) in the order flow.
Market profile is one tool that can point out possible areas of a stall / reaction that may ultimately result in a reversal.
The order flow isn’t visible for forex traders in general, this is something to have to qualify for, and is called Level 2 – the typical use is Futures trading.
Although most larger firms go out of their ways to hide the volume they are trying to accumulate without unintentionally triggering a reversal, there are others with different intentions: they are trying to spoof the market into a reversal by placing an outrageous sized pending order – that they usually pull at the last second – what can you lose, the broker would only give you a partial fill at the maximum size your account can afford, as a worst case scenario.
Your anticipation therefore should be an educated guess of the level where a likely change in behaviour / order flow can happen.
Another hint, that is actually accessible on top of the fore mentioned two, is the RSI2 reversal divergence.
The reason for a divergence is that the trajectory of an incline/decline was broken by an accumulation / distribution, and since there are now participants holding the bag – they are under water ever since they opened, they would likely want to get rid of their unwanted positions for a break even, plus those, whom are in gains, may just have their 1-pip beyond the opening price protective stop loss placed. These events may tip the fragile balance of the scale that has been fueling the progress in a direction.
If you can point out these levels before hand then you can prepare on time to make the necessary changes.