I’ve only been Keto for about a month, but I’ve dieted all my life. This is my 2-cents, take it or leave it, it’s all good:
You’re not eating enough calories. You’re pretty tall and that’s not many calories for someone your height (I’m a bit taller than you and weigh the same). You may have put yourself into what I call “nuclear winter mode”. I’m, genetically, an easy keeper and when I cut too many calories, my body goes in to reserve mode. It figures the nuclear winter is here and it’s time to save up the fat. When my body does this, it doesn’t matter how much I exercise, I won’t lose AND it starts taking fuel out of my muscles to squirrel away the fat. I can, LITERALLY, see it happening. I’m fat, but I’m also pretty muscular and I can watch my arm muscles fade away. I really, really think that you’re too low cal. You should probably be eating around 2000 calories per day.
Also, on this program you have to really eat a lot of fat. Start thinking “fat, fat, fat, I have to eat some more fat”. It’s EXTREMELY counter-intuitive, especially if you’ve been a life-long dieter. Are you hungry at all? If so, you’re not eating enough fat. It’s weird, I know, but it takes really changing our thinking.
I use a free app called “Carb Manager” to help track my food and to make sure that I’m getting the right number of macros in. I’m 58, and, basically, your size. I put this stuff in when I started the app and it has me eating 2105 calories. The nice thing is that it deducts your exercise, so you’ll see that, after exercising, your really only eating 1600 calories (or whatever). I have found it to be a LOT of food and I have a big appetite. You might try this app and see how it works for you.
Finally, you had a tremendous lost the first month. I know that I have a very severe plateau at 220 lbs (I just entered it last week. No movement on the scale). It is VERY hard for me to make the scale move at that weight as my body really, really likes being there. You may just need to be a bit more patient. Once I move below 220, though, I then lose pretty easily again until my next plateau. Try not weighing more than once a week - that helps a lot. Also keep in mind that old stuff about the fact that you’re also putting on muscle, and muscle weighs more than fat, blah, blah, blah. It’s true, tho.
Hope this helps!