Thanks for posting.
The short answer is yes - you may be wasting your time with this one. It is severely underexposed, and lacks attractive lighting on the subject. While you can boost the exposure in post processing, it's never going to achieve the look of the subject in daylight or even a nice backlit image.
That said, you can learn from the image. One learning is how to recognize the potential problem when you made the image so you can adjust your exposure settings. Silhouettes and birds with sky as background can be challenging, but the lighting is predictable. You might simply dial in 1.3-1.7 stops of exposure compensation next time you have sky as a background. The Exp Comp button on your camera is right next to the shutter so it's a very quick adjustment. Even if you are not perfect, you know you need +1.0 or more of compensation.
Another thing to learn is what you can recover with dark shadows. Sometimes it's good to know you can recover something so might not discard an underexposed image. There may be specific tools or setting, and you might even have steps you take with noise reduction on a heavily underexposed image.
I love images of backlit birds with rimlight or light coming through feathers. Even a silhouette image can be a good photo, so you don't necessarily need to make every image a frontlit image. I would photograph a little tighter if you have a longer zoom or telephoto. In this case, my goal would be to simplify the image to bring out the graphic design of the backlit birds.