This isn't "adding sound effects" — it's changing the performance context. When Suno sees [Live Crowd] or *crowd cheering*, it dials back vocal processing, loosens the timing, and adds spatial depth. It genuinely sounds like a live concert recording.
Why does Suno always sound generic? Because you only describe "genre + vibe." Swap in "Jupiter-8 saw wave bass with reverb tail" and Suno gives you the exact sound you're after.