It is near impossible to find anyone to do them with as there is nothing that drops that is worth anything, not even a lead.
Deadlands portals has a lead and a motif but blackwood portals just has trash and the overland gear, which of course you get from dailies, WBs, chests etc and can more easily be farmed that way.
Plus the boss in the portal is just as powerful as he is in deadlands, very tricky to solo.
Havocrels which you have to be a true warrior to solo drop nothing but the overland gear.

Why not have the havocrels drop a motif, like the ancient daedric motif leads.
Have blackwood portals drop the ancestral akaviri leads instead of both motifs being locked behind money sinking layers of RNG treasure maps.

I can't help but think this is a literal dev oversite that needs to be rectified, like they intended for the motifs to drop from these things but changed it at the end to pad out the antiquities.
Obviously these 2 zones were made during the pandemic so I assume the dev quality was not as good as other DLCs as many of the devs were working from home (not a dig, just a general understanding ones motivation will be less when not working as a team)
It clearly shows in Blackwood as the zone is barren with cut and paste reused assets.

I am late to the party on these DLCs as I have had years off, so am trying to get the achievements done, which is a mission in of itself to find people.
Deadlands portals were difficult to find people but I managed to recruit people as it drops a lead and motif.
These 2, well I have only seen 1 low CP in a blackwood portal and people often just run past Havocrels.

Havocrels are cool too, I would actually really love some sort of high level world bosses like that but with 25 million health where 50 players need to join in to kill them.
There is the similar one in galen of course that driops a lead.