What might change that or make it stronger?
The GBPUSD fell on the back of the ECB decision yesterday. It was more a reaction to the EURUSD’s fall. That fall took the price right to 100 bar MA on the 4-hour chart.  The 200 hour MA was also in the vicinity and the 38.2% of the move up from the Feb 29th low.  Since then – with the help of the EURUSD surge perhaps – the pair has pushed back higher.