Well, 1.66 to 1.80 its impossible, i dont want to lie to you. I was searching about height growth when i was 15 too and i was 1.66 too.
I was a skinny-fat looser, with bad posture too. I had shit diet and shit sleep routine + i was kind of depressed. At 16 i started doing stretches when i woke up and sometimes before sleep. I improved my diet, including foods like raw milk, eggs, red meat(homemade). I also stoped eating McDonalds and all this crap as i could.
Doing all that since the age of 16, now at the ending of my 17 years, in some days i become 18, i am 1.70 cm, with good posture and gymmaxing.
Also there is a way to get to 1.80, and its surgery, which if you are so dispaire of you can try. More, you can blast hgh which i dont reccomend.