I want to sign up for a group trip. I don’t know which travel agency is the best in Lanzhou. Can anyone tell me?

It depends on where you go. You'd better consult a travel agency, because some agencies don't accept individual travelers. You can ask Lanzhou Golden Desert. I reported to them when I went out alone. The tour was very good. The tour guide was very considerate. Her surname was Yang. I still remember her phone number was 0931--3535931