In the name of Allah, Most Gracious, Most Merciful
Assalaamu `alaykum waRahmatullahi Wabarakatuh
There is only one way to make up for previously missed fardh salah. That is by making Qadha of them. One cannot perform nafl salats as a substitute or cover up for missed fardh and witr salats.
And Allah knows best
Wassalam
Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah