Is it necessary to vary the morning remembrances (adhkar) and supplications (du'a), or is it permissible to limit oneself to the reported remembrances with the same wording?

It is advisable to limit oneself to the prescribed remembrances (adhkar) and not add to them, because the Shariah has defined them, and adding to them is a reprehensible innovation (bid'ah makruhah). The origin of the prescribed supplications (du'as) and remembrances (adhkar) is based on divine revelation (tawqeef) in terms of their wording and number. Therefore, it is obligatory to adhere to them without addition, reduction, or alteration. Varying the remembrances is not obligatory but is preferable, in order to gain benefits such as presence of heart, choosing what is easier, and increasing praise of Allah.