I finally managed to finish it!!
It took longer than I expected, and I didn't put on that many additional decals, and as a final touch, I had to stick masking tape on all of the clear parts of the Psychoframe before spraying on the matte finish, which was really hard, but I'm relieved that it was completed without any damage...
This time I added water transfer decals, but when you put a lighter colored decal on a large area compared to the part you want to stick it on that is a dark color, air bubbles become noticeable unless you let the air out properly. Small, thin decals aren't that noticeable, but it's hard to finish large decals neatly.

Banshee Norn Destroy Mode completed | ひろ's Gunpla works