What is the ruling on seeking forgiveness, glorifying God, and reciting specific remembrances (adhkar) compulsorily and consistently after every obligatory prayer, and is this considered an innovation (bid‘ah)?

Seeking forgiveness (Istighfar) and glorifying God (Tasbih) are prescribed after prayer. If the specified remembrances (adhkar) are the post-prayer supplications (mu'aqqibat as-salat) that are authentically reported in Islamic law, then they are recommended (mustahabb) and not obligatory (fard). No one has the right to impose them on another, unless a person vows to perform them, in which case they become obligatory for that person, based on the Prophet's (peace be upon him) saying: "Whoever vows to obey Allah, let him obey Him." However, if they are regular recitations (awrad) that are not established by Islamic law, then adhering to them at specific times is considered an innovation in religion, based on the Prophet's (peace be upon him) saying: "Whoever introduces into this matter of ours that which does not belong to it, it is rejected."