Hmm. Your structure is close to When Harry Met Sally or Searching For Bobby Fischer. Although the former has a Change MC so is technically closer structure-wise, I think you could find more storytelling similarities with Searching. As I recall in that film most/all of the OS characters are involved with the whole “chess scene” and at face value the story seems like it could have an Obtaining Concern – winning the chess match, achieving #1 status. Kind of similar to your story how it seems like “finding the boy” could be the Goal, but it’s not.
In Searching For Bobby Fischer, the Goal is something like “fulfilling desires” – not just the desire to win at chess but to have friends, to be a good parent, etc. You could imagine Josh losing at the end, yet the story still ending in a triumph if everyone felt their desires were met.
Maybe this can give you some ideas for your Story Goal.
Do they find the boy in your story? One good test is that to imagine different versions of your story – one where they don’t find the boy but still Succeed at fulfilling desires, and one where they do find the boy but Fail their desires. These might not be your story, but they shouldn’t be unimaginable.