Hah! Perhaps people think it's a presumption that they can advise!
In a way it's a big ask because it means looking at the score which is large and unless someone has a very tall screen, probably wouldn't fit as a full page. It doesn't fit mine. So that means an amount of study, anyway.
However, I'd say you need minimal percussion with this piece: timps, possibly a suspended cymbal with a soft striker (but very sparingly).
It doesn't seem to cry out for much percussion. There's no full tutti where a cymbal bash would add dazzle. It doesn't seem to modulate out of the natural F#minor. A slightly sombre mood.
You see, the piano and harp set the 'percussive mood' if there is such a thing, along with the string pizzicato passages. They mark the rhythm. Places where I'd think about a snare are on a weak beat (such as the high F in the flute part at bar 50). No use adding it at the beginning of such bars as that would upset the rhythm. I mean, there's no point that would seem enhanced by the rap of a snare on a strong beat.
So from my point of view I can't see anywhere that I'd add percussion.
Ps. It would help if you could condense things like woodwind and brass for a 'conductor's' score. You could lose a fair few staves and btw you need dynamics for ww and brass in bar 11