Honestly, I feel it might be good to return to the city once, as well.
Even though one could argue we have consumed almost no energy, the enemy is powerful.
It might be good to do preparations for a boss fight.
It's possible to hire skilled warriors just for the sake of the boss fight.
I don't know just how many swordsmen there are who can decapitate a Hydra’s head. But with the city’s number of adventurers, if we were to search, I'm sure we could find at least one.