So shall I stop mala japa and start reciting mother’s name Maa Maa … ? Because I want to chant one name always  silently and internally like my earlier mantra🤨. 

That would be the best. Sri Aurobindo writes to someone  seeking initiation.

‘Please initiate  me into a tangible form of Yoga. I make this assurance that I shall follow your instructions to the very letter and refer to you my doubts and difficulties on the way.

There is no method in this Yoga except to concentrate, preferably in the heart, and call the presence and power of the Mother to take up the being and by the workings of her force transform the consciousness; one can concentrate also in the head or between the eyebrows, but for many this is a too difficult opening. When the mind falls quiet and the concentration becomes strong and the aspiration intense, then there is  a beginning of experience. The more the faith, the more rapid the result is likely to be. For the rest one must not depend on one’s own efforts only, but succeed in establishing a contact with the Divine and a receptivity to the Mother’s Power and Presence.’

30 November 1934

Affectionately,

Alok Da