There’s no “thing” there to be sacrificed. It’s not like the handful of progressive Dems have this grand agenda they’re on the verge of implementing. And not just because TPTB are opposed, there’s like 4-7 members of “The Squad” in a body of 435. There’s no unilateral path there.
The most impactful thing that can be done in that position is giving a voice to the message that the leadership is broken and decrepit and needs an overhaul.
“Look, we gotta gas some of the untermensches, that’ll make the bloodthirsty horde satisfied so they won’t gas all of them. What? Don’t be ridiculous, they won’t get more bloodthirsty.”