The Witr prayer should not resemble the Maghrib prayer

The Messenger of Allah ﷺ said, "Do not perform Witr (the odd numbered nightly prayer) to three rakahs making is seem like the Maghrib prayer. Rather extend it to five, or seven, nine, or eleven rakahs, or even more than that."

قَالَ رَسُولُ اللَّهِ ﷺ «لَا تُوتِرُوا بِثَلَاثٍ تَشَبَّهُوا بِصَلَاةِ الْمَغْرِبِ وَلَكِنْ أَوْتِرُوا بِخَمْسٍ أَوْ بِسَبْعٍ أَوْ بِتِسْعٍ أَوْ بِإِحْدَى عَشْرَةَ رَكْعَةً أَوْ أَكْثَرَ مِنْ ذَلِكَ»