Retaining wall height has to be incresased, Proper cemented linned/gradient  drainage system is to be constructed.
Naveen Kumar Nigam, Kezhasilie Chiezou, 2022, Remote Sensing based Macroscale (1:50,000) landslide susceptibility mapping in Toposheets 82O/04,8,11,12,15,16; 82P/07 to 11, 13,14 and 83 M/05 covering parts of East Siang, Upper Siang, Dibang Valley and Low
 Slide triggred due to incessant rainfall and extensive slope cutting during road widening, Suitable suggested remedial measures are to be taken.
Anini-Etalin slide
Anini-Etalin road section
Increase the height of the retaining wall with sufficient weep holes and benching,  and proper linned drainage.
Lack of proper linned drainage,  Steep slope, Lack of slope moderation