Already betrayed by the gnoll. If reading correctly, some goblins left alive after the parley session. What are the chances one seeks profit by informing on the party? Seems staying in the dungeon risks encounter during any rest in the dungeon, either from something a goblin brings by, a totally random encounter, or a search party looking for whatever killed its friends. Use remaining healing that can be replaced by rest to get all party members to a point where one minor hit won't drop someone. Put away the worst of the clank clank armor and other noisy things and try to sneak/stealth out of the dungeon and get to the rest camp. Any spells or such that can improve stealth should be used or at least ready.
If successful in getting the rest, then decide what to do. If not, further planning probably moot.
If successful in getting the rest, then decide what to do. If not, further planning probably moot.

