can I take taxi or minibus from Kowloon to Luohu Commercial City Shenzhen? Thanks

Hi, I'm afraid it is a little hard because you have to cross the border from HK to Shenzhen.
From Kowloon, I suggest you go to Hong Hum to take the East Rail Line to Lo Wu. Then you can easily cross the border to Luo Hu of Shenzhen. Then you can take a taxi to the Commercial City.