What should my target weight be?

Hi, I have lost a fair amount of weight, first from fasting and healthy eating, and now by healthy eating and exercise. I am trying to adjust my baseline target, can anyone help? Here is where I am now (chart in Kilograms, it's x2.2 for pounds).

Currently I am eating a healthy plant based diet, and just increased exercise to about an hour of cardio each day, and weights every four days. This has been so since the start of the current weight decline, starting around 23 January, though the gym stuff I started 2 weeks ago. Prior to that was fasting / healthy eating. When I was young (teenager) I was thin and weighed about 59 Kg, my height is 167cm to that would have made my BMI around 21.2. However my Tanita Innerscan Body scale says I am 23.5% fat. Now if that is by weight, and assuming around 8.5% fat is healthy, shouldn't I be subtracting around 15% from my current weight of 77.5Kg? I make that around 65Kg, BMI around 23.3 - which seems a bit high to me.

I guess I could wait and measure the fat as I lose weight, but I just wanted to have an accurate target weight that's all. It's easy to adjust the green baseline, I just upped it from 59 to 65, but not sure if that's right.

Oh yeah, and things did go a bit pear shaped over Christmas, but issues surrounding that are now resolved.

My overall aim is to be slim and fit.