No need to pay.
You can just reapply directly. The previous application will be automatically deemed withdrawn after 2 months.
If the fee has been paid, you need to submit a request to withdraw the patent application.
If you want priority, the filing date is the filing date of the original application. However, a priority fee of 80 yuan is required.
No priority, application date will be postponed.
If someone applies between your priority date and the later filing date, it may affect your novelty, but the probability is unlikely.