This in fact has happened for some. There are others who are in a future extension of the present reality and only have that higher dimensional status because they are in a future extension that is on a kind of different frequency plane than the physical reality you are experiencing as a physical human. So the Pleiadians, for example, are a future extension of the Reptilian race; they have not ascended through solving the dilemma of free will and free agency in avoiding the pitfalls and conquering the force of evil, so they are in a provisional environment that will depend on everything that happens for them as an extension of the current physical realities.
Most physical beings are under the thumb of the interlopers within your galaxy. Those in higher planes are in higher dimensional states of being outside your galaxy or are in a future extension that is protected from the effects of evil. In a sense, it is a state of being earned by being in divine alignment, so even though you might be in a physical existence with evil beings out and about, if you are living a life in divine alignment, that will create a future potential where that can be enjoyed and enjoyed in a way free of manipulation and harm caused by the darkness. So there are many in-between states and potentials for overlapping with profound changes taking place within the physical, as well as the looping back through time of future extensions to influence what you perceive of as the present to be influenced positively or negatively, as the case might be, with circumstances going on in other timelines your soul is experiencing through its extensions. This is simply the basic fabric of existence and an aspect of the consequence of creation in how it proceeds. It is a multidimensional complex of energies that is quite intricate but purposeful and has a structure and organization supporting many complex interrelationships, all of which have value, and multiple potentials that can be explored and exploited in beneficial ways or to accomplish a restoration and healing if need be. So this is nothing to fear, it is part of the joyous and wondrous magic of life in the vastness of Creator’s energy.