Hello,
One issue could be that there is a logo for DHL in your main photo, which is a generic business, one that operates around the world. I would try and take a better main photo without the DHL logo in it, maybe of the front of the post office instead of the sign outside.
In the US, our post offices are acceptable, and most are seen in a historical view of being social hubs. In the past, and still in some rural areas, people met at post offices and maybe had a chat with others in town. You also send mail, a type of social correspondence at times, even though it’s not used as much as it used to, but it’s still used.
We have quite a few discussions in regards to post offices, and here’s one of them: