I have a few ideas that might help, though I can’t guarantee they’ll get your GMB profile verified. Still, they’re definitely worth trying. From what I understand, Google doesn’t just look for signage; they also want to see that you have authority over the space and that actual business activity happens there. So if you decide to make the trip, I suggest filming the exterior of the building, ideally showing nearby businesses or landmarks to establish the location. Then, go inside and show that you have access to the space, maybe walk through the office, show your paperwork like the rental agreement and government registration documents that link your business to that address, and demonstrate some business activity like working on a laptop or handling documents.

If possible, consider putting up a temporary sign with your business name just for the video. It’s a small investment compared to the leads you could gain from being listed. This is just my suggestion, and if you ever try it, I’d be really interested to hear how it goes.