If the image doesn't have a solid foundation you won't be able to fix it in post with bloom and fancy flares. Light is light, if your composition, framing, materials are not good there is nothing you can do with IES or HDRIs to make it look good.
First, work on your framing and composition, right now it is not interesting at all. Elements in your image are cut off the frame and you don't have a sense to where you should look first and where to rest your eyes. Try to give the viewer a sense of space and how you could walk around.
Second, materials look flat. Almost look like a simple diffuse. Work with your glossiness map, it gives depth and richness to your surfaces, add variation. White is never white. Add imperfections, subtle bumps. It will make your roughness and speculars pop up. Every single material should have reflection, even though it is a matte surface. Avoid CG edges. Break up your geometry, make it look more natural. Basically add layers and layers of variation and subtle imperfections.
Your image does not have shadows. Learn to color grade. Take a look at some tutorial about color grading and reading scopes. If done right it will dramatically improve the look of your colours and grey values. Don't be afraid of shadows or having darker areas in your image. Show something through the windows. Even though a photograph with a correct exposure for the inside will result in a overexposed outside (unless it is a HDR picture), you will still see some of it.
Finally for light, try for find a more interesting situation, again, to generate more shadows.
There are always a lot of things you can do to improve and image, these are some of which I would consider. Also, look for a reference, always work with references.
