Kindly refer to the following link(s):
Dhikr after Fard salah &innovations of putting hand on head & reciting AyatAlkursi etc
Can we say adkhar after Sunnah prayers or must we recite adkhar only after fard prayers
Can we recite the prescribed adhkar after sunnah prayers instead of fard?
Can I say other adkhar after prayer, that are not from prescribed dhikr after salah?