i do dua after ruku in witr do i go back into ruku after the dua and complete the salah as normal? or after the dua do you go into sujood?

salam i've read hadiths which are different to the way i usually pray witr. i have tried to find answers to my question but i haven't been able too. say i'm praying 3 rakah witr. one after the other without sitting in the 2nd. **in the 3rd rakah after ruku i do dua. do i go back into ruku, stand, sujood and finish the salah or straight into sujood after the dua and finish? please help** jazakallah