Momentum chart - GBP/USD

I have the following chart for which I have added a downward trendline (moving average over 4, 9, and 19 days, and a momentum chart at the bottom.
I’m not sure I fully understand how to interpret the momentum chart for this downtrend. Does it in theory show that a good place to enter a down bet is at at 0.1 level? I don’t see how it’s any different from the trendline I’ve drawn.
Also, isn’t the GBP/USD flattening off at the moment? I only want to start with one currency pair so as not to complicate things but if it’s flattening off then it’s going to be difficult to learn from my trades as much?