As far as I can see, exposure was right (speed is right, I see plenty of detail in shadows) but my dev time must have been short, mid tones are grayish and lifeless.
try a slightly longer exposure, maybe 50 percent, then burning in the brighter areas while dodging the shadow areas a titch, and knock your contrast up a notch.
I'm not sure how far I can go without being too digitally involved.
If this is a straight scan, it explains it. They always come out too flat. If you print it in darkroom, you are likely to find it's ok.
What I think you need is more contrast. I loaded it into NX2 and slid the black point to the top edge of the histogram. The image improved significantly. So in darkroom term, bump up the contrast one to 1 1/2 grade and expose so you get a full range of tones.
To me, your biggest problems are faces. They are gray. They need to be much lighter and brighter.
Scanners can be tricky. The better ones have sophisticated SW that have essentially built in mini-photoshop so you can work with the "raw" negative before it produces the jpeg.
The whites just need to pop some. Take the highlight slider in levels and move it in some. I would also lighten up some of that shadow area on the left.
The whites just need to pop some. Take the highlight slider in levels and move it in some. I would also lighten up some of that shadow area on the left.