With the exception of something like plunge, make them all give a resource?
Maybe make Bloodspiller/Quietus into another healing move
Make Shadowbringer give blood
Maybe some enhanced resource generation while inside of Salted Earth?
Oblation or Darkmind should just be the return of something like blood price, take damage to gain resource, which is honestly the only remaining identity Dark Knight currently has, carried solely by TBN.
Just random spitball ideas here, but anything would be better than Dark Knight having so many weird ogcds that don't really do anything other than damage. Its kinda sad we've gotten to the point where DRK has so many ogcds that it managed to get top DPS while feeling so jank.