You can read in my previous thread about my struggle with this part. I made a milestone just now, increasing Indirect clamp will remove the fireflies, however the shadows are now too opaque.
Am I focusing too much on Indirect clamp? Are there other settings I should attempt to play around with?
I am using Blender 2.92.0 with my GPU Radeon RX 5700 here is my blender file: https://pasteall.org/blend/85a361fe32cd41378a4fe8721f693aa0
If you attempt to render my file please let me know if any settings are local that I need to change, or if they are per blender file.