I just checked your Nucleus diagnostics and it looks like you have 140k tracks imported to the Core. I would go with option C and install more RAM in your Nucelus. You’ll need to use CL19 Unbuffered DDR4 RAM, please see the following thread for RAM suggestions:
Thanx for the answers. Can I get somewhere some instructions/manual how to perform the swap of the ram. I open the id, removed the hard drive, but it seems that also this plate which holds the hard drive should be removed, because I see there down the original RAm.