Kusari

[Skyrim]

Or the players could work toward removing the embargo on trade which is ruining Kusari trade even further?

That sounds like an interim solution.

The activity of Kusari in general was low both before and after the trade embargo. I have played in Kusari actively since 4.83. From 4.83 to mid 4.84 it was an active house, ever since then it has always suffered from activity when it comes to official kusari faction players. Kusari trade has been active as ever for the random merchants, it was super-active during 4.83 when niboium/diamond route existed but it's still pretty active now. What has caused a change was the fact that the ore shipments from Omega-11 have stopped dramatically with the new changes to the mining mod.

The trade embargo is irrelevant to the activity.