About those Borg. They simply didn’t have the wit to conquer the human race.
They couldn’t do it force-on-force toe-to-toe with us.
They could easily do it simply by parking a cube in NEO, and advise us that they could offer to treat the terminally ill, the fatally injured, and the extremely aged a way to carry on - pain free.
Enough would go for it in each generation that we would be fully assimilated without firing a shot. Children would aspire to be a Borg when they grew up, to be with g-g-g-grandma and grandpa, fishing trips and milk and cookies forever!