GBP/USD is approaching a crtiical point as the RSI shows it is seriously overbought now. It's fair to assume a correction will take place, once price touches the upper trendline around 1.29 level. Note: Pay attention to USD strength - the weaker the USD, the more likely for there to be a break above the upper trendline.
NOTE: Not professional investment advice. I will not be held accountable for any losses.
Do you believe it can go long until the shorter term monthly trendline (jan '15-july '20)? USD seems that cannot keep up with the european currencies, as investors seem to believe that Europe is in a far more advanced stage on fighting coronavirus. I'm also watching on possible rejections on the upper trendline you are mentioning, combined with possible supply zone on 1.295. Overall though, I think we'll have to wait a bit longer for a higher probability sell opportunity.