Craft sigils
Scrap those that don’t have strong room affix
Run NMD until strong room pops
Run strong room
quit dungeon
repeat until escalating sigils drops
run through 3 dungeons as quick as possible (ignoring content)
fight end boss
Repeat
if this was your season to reinvent NMD and make them into meaningful content then it is a complete failure.
NMD need to be more rewarding - even decent XP for completion would be a start, maybe also with additional (significant) XP boost for completing objectives in the NMD.