I love how this new TL (thanks) saved us on a cliff and left us with this chapter, with just another bigger cliff. It's toying with our feelings at this point !
Thanks for picking it up.
As others have pointed out the correct translation for 踏ん張る (funbaru), in this case, would be "Stand firm"
But I'd just add, that "Do your best," in this context, basically means the exact same thing so... yeah.
Ey! Nice... now, let's keep going with the less-than-mediocre plot building because MC did suspect someone controlling the stampede but still lowers his guard after killing the last monster in the stampede without a sense of security that everything was going to be a-ok because something outrageous didn't just happen and there's no reason in sight to explain it yet! But anyway, judgement aside, let's see where this will go XD!