I just checked the free valhalla-supermassive plugin works in Audacity on Windows*
https://valhalladsp.com/shop/reverb/valhalla-supermassive/
It does realistic room-reverb, chorus & flanging,
but its USP is ridiculously long (minutes) reverb-delay special-effects,
https://youtu.be/so4myM0ERbc?t=46
(* also available for Mac)
Grab their “space-modulator” while you’re there, (for all things flangy) …
https://valhalladsp.com/shop/modulation/valhalla-space-modulator/