The next day, you can visit Binjiang Road, the largest shopping street in Tianjin. If you have time, you can also go to the nearby Fifth Avenue and Xiaobailou European Style Street.
The route can be arranged like this
Day 1: Drum Tower-Ancient Culture Street-Italian Style Street-Haihe River-Food Street (visit ancient culture and taste Tianjin cuisine)
The next day, binjiang road-Fifth Avenue-Xiaobailou (shopping, sightseeing historical buildings on Fifth Avenue, and leisure in European Style Street).