Hi, I'm travelling alone to Guangzhou for 4D/3N. Besides shopping, seeing the modern GZ, I would like to see some ancient part of the city, can you suggest itineary?

Here is my general suggestion:
D1, go and enjoy yourself at Chimelong Resort, where the Safari Park, Water Park and International Circus is worth a try. Then the local zoo deserves your visit.
D2, you can go to White Cloud Mountain (Baiyun Shan) to have a joy. After that, Yuexiu Park is recommended, where you can see beautiful scenery and its large number of historical relics such as the Five-Ram Sculpture, Zhenhai Tower, the site of the Ming Dynasty City Wall, and the Square Cannon Site.
D3: Ancestral Temple of the Chen Family can be visited today. At night, you can take a cruise to appreciate the view of Pearl River.
D4: Shopping day. Local Shangxiajiulu Pedestrian and Beijing Road are highly recommended.
Hope help!