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.
Render with Indirect Clamp to 0, lots of fireflies and denoise distort:
same settings except I changed Image to Denoiser instead of Noisy image to Denoiser node, still distorted but more detail seem intact: 
Render with Indirect clamp set to 2.0, shadow too opaque: 
Render with Indirect clamp set to 5.0, this is the best result I got so far but I still feel is nowhere near the ideal result: 
This is Andrew's cup in the tutorial, the lighting I am aiming for:
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.