Okay bud, I have seen lot of renders
like this and I seem to know what the problem is I have been messing around architecture for about 3 years now.
You first problem is the lighting and the materials in case of the materials you don’t have good enough materials and most of them are flat and rough and perfect nothing in the world is perfect you should try to you know use surface imperfections in materials
Make sure you are using the filmic colour space and not the RGB that enough flatten your render and make your lighting blood out it should be blown out that should increase some of the perfection in your render I not to be offensive your modelling is one of the worst I have ever seen so please try to improve your models or by some online and there isn’t much time to model everything in architecture and you should really use model libraries
I don’t know what you are using but you should be using the cycles render engine not the evee engine that will give you some more perfection
Also blow out the images in your PC they look fake use stronger lighting and I think that should really help I help you find this interesting and helpful
P.S sorry i didnt read all the specs before.