Hi xiaoyuzhan,
Because time is not a factor, you may consider retaking the GMAT to get a more competitive score. I’m also happy to provide some advice for a retake strategy but first have a few questions:
1) Did you get your enhanced score report? If not, could you do so and share the score breakdown from your most recent GMAT?
2) Did you take any official MBA.com practice exams prior to your GMAT? If so, can you provide us with the dates and score breakdowns from those practice exams?
3) Describe your study routine. For how many hours a day have you been studying and for how many total months? What resources have you been using for your prep?
4) For how many hours a day and for how many months can you study for your retake?
Once you provide us with some more detailed information, we can provide some more personalized advice.