How to reverse diet in order to maintain healthy weight loss?

So before I say anything I know what I did was wrong and now I am trying to remedy the situation so please don't come at me in the comments.

I'm 21 years old, female, currently weigh 68 kg and am 166cm tall. I've lost around 17 kg in the last 3 months by doing keto and eating at an extreme caloric deficit where I was only getting around 800-1000 calories a day. I've now come off keto and am still eating around 1000 calories a day but my weight loss has completely stopped. I've calculated my TDEE to be around 1900 calories so this is quite worrying. I know my body has adjusted to the low amount of calories I was giving it and now I fear that I've completely ruined all my chances of having a healthy diet without gaining all the weight back. I want to be able to lose weight (around another 8 kg) more sustainably by having a healthy diet but I don't know how to fix my metabolism.

Would appreciate any constructive criticism and helpful advice!

submitted by /u/candyflip98
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source https://www.reddit.com/r/loseit/comments/ga65v6/how_to_reverse_diet_in_order_to_maintain_healthy/