Our government spent $6.82 trillion in 2021. $54.6 billion represents about 0.8%. No doubt any program funded by the government could probably be done with greater efficiency and less waste, but the space program isn't responsible for other things going unfunded. I think there is tremendous value to the space program. I suspect many of the conveniences and modern luxuries you currently enjoy are the result of R&D related to the space program (whether through invention or improvement), including the device you used to post on this message board. The contributions to technological advancement are too numerous to list...materials engineering, aerodynamics, computer tech, robotics/automation, communication, medical tech, etc...there are websites out there that document some of the specifics. Aside from the abundance of technological advancement, our space program has been the seed for much biomedical research. Muscles physiology, cardiology, bone health, mental health, imaging techniques (x-ray, MRI, infrared, etc...), being able to medically treat people remotely have all benefited from NASA research. Space exploration now is the key to progressing toward the future. We can speculate on those potential payoffs, but many of those benefits are probably unknown until they are realized. Space has the potential to provide us with an abundance of resources that are more rare on earth. Asteroid and moon mining can have potential huge payoffs. Asteroid 16 Psyche is estimated to contain enough gold, platinum and precious metals to value around $700 quintillion...that's about $100 billion per human!!
Space exploration provides employment for tens of thousands in the STEM areas and so many more in supporting roles for the industry. Space exploration provides a platform for international cooperation, common ground for nations to actually work together toward goals potentially beneficial to all (if not mismanaged which is a concern). The space program gives us insight into protection of our planet...solar flares, radiation, magnetic pole shifts, impact events, climate research...things that may influence our chances of survival. Humanity may very well need to become a space faring civilization. Even if this may be in the very distant future, you don't simply turn that switch on, you have to make slow progress towards those capabilities.
Let us not forget the benefits of satisfying human curiosity. It is within our very nature to want to explore the unknown, and try to comprehend our place in the cosmos. To learn about the cosmos is to understand ourselves as we are part of it. This may be the most valuable reason of all to continue investing in the space program.