I have tried to motivate myself for years but this time, I found my true motivation and never slacked off.
So I have to wear this costume for Halloween, and I tried it on. It fit perfectly but my body didn't look too attractive in it. And I was like MAN! do I need to lose weight. ((Btw I was 75 kg at 5'5''))
Motivation just comes to you. It's like getting shot in the heart. It's sudden and blows you away. And when you are truly motivated, somehow, everything seems easier and less enticing.