Ultimately [[You are what you seek]]. So won't practice engage an effortful [Part](Parts) of us to "do something" as if we need to get something we don't already have? It can, and most spiritual and healing practices are implicitly or explicitly dualistic. For example, telling one to focus on their breath to the exclusion of all else is effectively telling their meditator part to focus on something that they're not to get a state of concentration that they don't already have. ([[True spiritual practice is not about manipulating experience]].)
But teaching one that there's "nothing to do", because they're already free, may not be true of one's experience if the sense and feeling of the doer [Part](Parts) is still present. For this person, the thing to "do" is investigate the sense, belief, and feeling of the doer: [[True spiritual practice is sincere investigation of our experience]].
See also: [["There's nothing to do" is ultimately true, but it's a relatively untrue and unhelpful teaching]] and [[No spiritual practice directly causes awakening, but practice helps indirectly]].
References: [[Rupert Spira]]