I want to point you to a couple of articles that may help you with future nominations. If that second photo was your supporting photo, it should show the point of interest you are nominating, but it does not.
Here is a collection of ideas.
I don’t have any suggestions for convincing reviewers this particular sign is more than just a generic alert for drivers that they have crossed the county line. I do understand that there are some places that just don’t have anything eligible to submit. If you would like to leave a general location, then some folks on this forum are good at looking around on Maps and finding things to suggest. But do remember this is a public forum if you choose to share your location.