Considering that cosmology and particle physics have become increasingly interlinked over the past few decades, how much more fundamental can you get? As noted in this article - http://ctcp.caltech.edu/fundamental.php - by the Moore Center of the California Instute of Technology "This focus area seeks to connect the fundamental laws of physics to the origin, evolution, and constituents of the universe."
Thank you for your response and for sharing this link! Forgive me for my silly question, I have just started learning about this subject. But I think I have a better idea about it now. I will be reading more about the connection of particle physics and cosmology. Very interesting.
JWST has greatly damaged the research program in fundamental physics. It's obscene cost overruns (the current estimate a factor of 17 more than originally proposed!) have caused a dozen other missions to be canceled, including LISA, which would have searched for gravitational waves.