gst invoice F Y 2019-20

No if u want u can continue and if u wanna start from 1 than be sure that it doest match with any of your presiciding year invoice no. in Gst and Invoice no should be of 16 character and unique so if in last year if u already generated invoice no with 1 than next year it should ne 1/19-20 or any different.

Thank you sir