Yesterday's increase was the third consecutive increase for GBPUSD, however there were signs of weakness because yesterday's D1 bar had a long upper shadow, swept to the nearest peak and then pulled back down, creating a false break. Because there has not been a previous break from the inside bar, GBPUSD D1 is still in a state of accumulation and price compression.
Creating a new high price peak and maintaining a gradually higher price high and low structure helps GBPUSD H1 establish a continuing upward price trend. However, due to the weakness in D1, H1 should only be bought from the strong support zone below. You can wait to sell if this bottom is breached.