The Rebbe highlights the significance of the first twelve months after the histalkus of the Previous Rebbe as a special time to strengthen one's connection to him. He encourages participation in the communal study of Shas, a practice the Previous Rebbe strongly promoted, as a means of deepening this bond and continuing in his path.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/teves/868