36 Inches Black Hair

36 inches of black hair, about 2.75 inches in thickness. The hair is thinner near the ends (the bottom couple of inches).
I have included a ruler in the pictures to reference the length and thickness. One of the pictures with the pink ruler has a ponytail holder to mark the place I’d like to cut off.
Hair color: black
Ethnicity: East Asian
Age: 27
Female
Location: Canada
Straight, with a slight wave.
I wash my hair once a week, and have always done so growing up.
My washing routine includes shampooing twice and letting the conditioner sit for a bit before rinsing it out. I mostly let my hair air dry, though I do occasionally blow dry my hair.
I mostly wear my hair in one thick braid and I put it in a bun when I workout/participate in sports. I do not use hairspray, gels, or waxes in my hair on a regular basis.
I have used an iron on my hair a small handful of times for special events.
I have never dyed or permed my hair. Neither me nor anyone in my household smokes.
I would like to cut off 36 inches max. The ponytail holder in the picture marks the area I am willing to cut.