Do you acknowledge the legitimacy of subjective experiences of other humans as much as your own? Do you acknowledge the same for other species of intelligent animals? Of a plant? What of the individual cells within your body? Do they have subjective experiences? I don't know how anyone can acknowledge that and then consider themselves an atomic consciousness. If you do, where reasonably do you draw the line? I believe you are raising human subjective experience above all others by claiming any human experience is essential. An objective reality can co-exist with a subjective experience of it.

We both agree the red light is red, and that it exists. We can agree because the relation its properties have with our entire experience of the physical world is consistent. I can find some light and measure the wavelength using a photosensor, without ever laying eyes on it, and tell you it will be red. You will observe it with your own eyes and agree it is red. Our experience of what red actually looks like is entirely our own and in no way can be compared. It cannot even be considered that they might be different because the operation of comparison is simply undefined for subjective experience. If you claim objective reality doesn't exist, you are entertaining solipsism. I will maintain that all of our subjective experience is rooted in an objective reality. If you claim you've seen a new color, we can recreate this and explain what causes this. If it's not something simple like a wavelength of light only you can see, it might be something more nuanced, like an internal experience unique to the micro-structure of your physical brain.

Many people entertain the idea that quantum mechanics hints at a link between the subjective experience and the physical universe through various interpretations. I don't think lay-people (me included) should be adopting any of these interpretations as philosophical evidence. We simply don't know enough yet. There are many experiments that have been and will continue to be done that further clarify the root of them that is the measurement problem. Decoherence theories for example are helping to explain what appears to be "wavefunction collapse" as the absorption of the quantum properties by a larger quantum system.

A question to end this long reply, since you mentioned it in your original post: do you consider panpsychism to be a valid idea?