Ruling on iqamah for Qadha prayers

Assalanualaikum, I have had a lot of Qadha prayers that have piled up over the past few weeks. I tried to segment them and make them up, but due to exhaustion and my current schedule I haven't been able to cover them. I have been trying to pray the fardh and cover the qadha when I can, shall I continue doing this or am I able to pray my regular prayers and then add nafl to make up for the qadha. As the amount of qadha prayers can be overwhelming? But I completely understand if I should just continue praying Fardh and cover the Qadha until it is complete. JazakAllah Khairun