السلام عليكم ورحمة الله وبركاته أحسن الله إليك In every fardh prayer, during sujood I follow a fixed order of dua. yani 1st rakah first sujood I do for Jannah, 2nd sujood for forgiveness then 2nd rakah 1st sujood for knowledge etc. I do this in every rakah to know which rakah I am. Is this a bidah?

Ustadh AbdulAziz al-Haqqan

No, and also diversify and i advise u to make the du'a's of the Prophet