Hi,
I'm writing this comment because you asked the community's opinion about the title. The first name - Xianxia Simulator seems to me quite good, the second Cultivation Quest - not really, I don’t really like the word "Quest" - it gives off something old-fashioned. The name Xianxia Cultivation Simulator seems to be a compromise, huh, but there is "Amazing Cultivation Simulator", i worry there is no problems with IP or Copyright in the future? I dont know.
One way or another, the words "Xianxia" and "Cultivation" are the first things that come to mind when someone googles content on this topic. Using these words in the name of the game will be a good idea for popularization of your game.
I wish you good luck in your development! I'll be looking forward to the results.