My complexion is so dull and sallow. What should I do to really brighten it up?

I'm so upset because my complexion is so dark and dull. It's not like I haven't been sleeping, but everyone asks if I look tired or if I'm sick, and it's gotten to the point where I'm embarrassed to go out without makeup. I consistently apply niacinamide and vitamin C serum, and I slather on plenty of moisturizer before bed, but only the surface of my skin gets shiny; the dullness coming from deep inside just doesn't go away at all.

If I apply a tone-up base or a bright cushion to cover it up with makeup, it just creates a color difference with my neck, and as time passes, it all fades away, making it look even messier.

Is going to a dermatologist to get a treatment like a toning laser or a skin booster the answer? What kind of procedure should I get? I'm really upset.