BonThot:
BonThot follows the tree line to the north, careful as he can be to stay in cover. His eyes are seeking where the goblins might be.
Tried another Perception check - rolled an 18. Woo hoo!
On your turn you can move and see if that puts you in line of sight to nullify their Hiding. If one then comes into your view, you'll have a chance for your Passive Perception to see them or for their hiding place to no longer quality and you just see them regardless of rolls. If not, you'll need to spend your Action if you want to make another Perception check.
You could also use your Action to Ready a cantrip or an attack, with a trigger of being able to see one.
In this fight, the goblins have a tactical advantage, so while I don't suggest you blow through all of your resources, I do suggest you play it smart and not take their being goblins for granted.
I'm going to be working a couple hours late tomorrow, but then my schedule goes back to normal. I have to start an hour earlier too, so right now I need to get to bed.