@gregger it's almost as if you've read several other isekai and they all have a formula that they tend to follow
They'll probably go through each of those, lets add more to the list:
>Guild Master dude sends them off to do an even more seemingly impossible task
>MC saves a slave girl
>new gear farm
>flat chested, aloof mage girl reluctantly joins party
>Guild Master dude does sneaky stuff to try to run the two out of the city