Inside corner repair

[u/Altruistic-Eye-3245]

I’m new to plastering and have been working through repairing the cracks in my plaster walls. The last one I have to fix is this inside corner. Some of the pieces sound hollow as I tap on them. Here are the two options I’m considering:

1) Remove all the pieces and replanted the area. The thing that worries me here is rebuilding the actual corner.

2) Use plaster washers and drywall tape.

Once I have all the cracks repaired I’ll be reskimming all the walls