The title is the key to this short poem. An "influencer" is someone who performs for an online audience, and the poem seems to picture that life from the inside. Noon, the brightest hour of the day, is described as a "black box," which suggests a screen: dark, blank, and sealed off. The speaker's own face is "often" in that same box, so the screen is where they appear to others and perhaps where they see themselves.
The second half is lonelier. Tired of sitting, the speaker sings, but the audience is "a laughing no one." That phrase is strange and a little sad. Something is laughing, yet nobody is really there. It could be canned laughter, hollow reactions, or the speaker's own sense that no one is truly listening.
The mood is quiet, wry, and isolated. The speaker doesn't complain loudly. They just describe the weariness of performing into emptiness, and the poem leaves us with that flat, uneasy image.