To me, enough is when you can say with affirmation and conviction that you a happy with your body. I don't think anyone can rightly say what weight is right for an individual apart from that individual. Also ensuring that you are still within the healthy limit and not the underweight limit.
My goal has changed over time. Initially I wanted to get back to 55kgs. BUT, looking back through photos I have of me weighing 55kgs I know I won't be happy when I reach that weight because when I last weighed 55kgs I was skinny fat. Now my new goal is between 50-48kgs (I am very small framed and short) this is not a an unhealthy weight for me. I have discussed this with my doctor (whom I've had as my doctor since my teens) and she said this is fine as it falls in the lower end of my healthy weight range.
So maybe go consult your doctor?
ummm genetics factor in too. I always felt like a giant standing next to my mother and sister as they are both petite (one is short and one is tall) but know I am slowly seeing my frame emerge under all that fat that was once there and I too have the same body frame as them. My point being have a look at your family genes. It might help you determine what weight is right, this would only work if your family is within the healthy weight range.
Start weight - 77kgs
Goal weight - 53kgs
Current Weight - 50.1kgs
No more weighing, no more scales. My measurement is my success at health. It's an investment I make every single day. My priority: be healthy!