At the moment with all the Brexit uncertainty going on, it is difficult to try and implement any technical analysis. Nonetheless, I have made an attempt to forecast the price of GBP/USD based solely on technicals.
The chart is quite cluttered with information, but I will try my best to explain what it is you should be getting from this analysis.
Key lines: Orange solid line Orange line with breaks
The solid orange line is the measured move from the low of Jan. 2018 to the high of 2018. The orange line with breaks is the same measured move placed at the low of 2018 (I'm using the 1.2477 as a low for 2018 since the flash crash low differs on various platforms.)
The cloned measured move from last year when placed at the low of 1.2477 extends to 1.3413, putting it right into Fibonacci confluence zone as depicted on the chart, as well as nearly reaching the 50% retracement from 1.4377 to 1.2477.
Purple resistance trend line: The first time price closed above the 4 year upper trend resistance line was precisely on year ago, and just before the end of the year price remained above it. Both times when price did close below it, a rally ensued, thus evidence that we might see a significant bullish rally again.
Therefore, the key focus should be that trend line going forward as it will most certainly be a decider for bullish or bearish sentiment.
The second solid orange line, is the measured move from 1.4377 to 1.2477, thus, should price get rejected if it reached 1.3413, the next target per the measured move objective is 1.1510/00, a level that has been mentioned a few times by analysts in recent times.
I believe there is a very good chance to see a bullish rally in the first part of 2019. Evidence for that is the fact that price is still trading above the 4 - now almost 5- year upper trend resistance line. Price bounced of the 78.6% Fibonacci retracement level at 1.2498, which is the same level from where the bullish rally commenced in April, 2017.
In addition, the Commitment of Traders report (COT) reveals evidence for a bullish rally as well. More specifically when comparing the data from Dec. 04 to Dec. 18, 2017 and Dec. 03 to Dec. 17, 2018. I am aware that the current US government shutdown has caused a discontinuation of COT data, which is why I compared it to last date when data was published.
COT Dec.04, 2017 Dec.11, 2017 Dec.18, 2017 Commercials: -17'094 Comm: -17'942 Comm: -26'832 Large Spec: +6'406 Large Spec: +11'388 Large Spec: +20'388
COT Dec.03, 2018 Dec.10, 2018 Dec.17, 2018 Commercials: +59'120 Comm: +61'589 Comm: +79'388 Large Spec: -39'750 Large Spec: -42'419 Large Spec: -60'723
Thus, looking at this data there is additional evidence for the case of a bullish rally to come. Also, I believe at this point the market has priced in nearly everything to start a bullish trend, especially from these 'dirt-cheap' levels which certainly attracts bargain hunters.
This analysis does not intend everyone to go long, but there is a lot of technical evidence pointing to higher prices to come.