Certainly, even if Muna refused to use her suite of spells and abilities to limit herself, there is one thing that Gods from the Milky Way Universe have that really set them apart from anything that isn't a living idea such as them; Truths.
>https://chaosquest.miraheze.org/wiki/TruthsIn a nutshell, the Truth is an arbitrary statement that literally overrides the "narrative" of reality itself. In other words, if a God just says that the sky is yellow, it is. Their arguments convince surrounding existence, forcing it to agree unanimously. This does not truly affect the world of Hainei because of the age of the New Eternity that acts as a universal limit to all things placed by the Emperor, but also merely because Gods choose not to make a Truth all the time. So, if Muna truly felt troubled by esoteric abilities and wanted to level the playing field in this mud wrestling match, she would just argue that all of the cultivation techniques no longer count, and they wouldn't. In fact, she has a Truth dedicated to just outright making "debuffs" not a thing that happens to her at all (Her Third Truth).
>td;lr the gods in Chaos Quest have their own version of the Umineko TruthsThat aside, she would like to teach Huan how to use and make Truths herself just to help her against Heaven. Fuck Heaven, all my niggas hate the Heavens.