Eat healthy can mean different things for different people under different dogma.
I can tell you what helped me, but we’re all different. I kept low carb, even though like you I also had to stop doing keto. But eating healthy for me still means limiting carbs. I cut also a lot on all the saturated fat I was eating. I still eat sat fat, but a lot less. My fat comes from some cheese, salmon, eggs, olives and nuts, mainly. I don’t add fat to my food, unless really necessary, like when I fry eggs, or to make a mug cake.
I avoid rice, pasta, wheat things (cakes, normal bread, cookies, pancakes, pizza) and also potatoes. But I eat grains and seeds in moderation.
My lab fasting glucose went from above 110 to high 80s. It took time to bring it back down after quitting keto and carnivore.
I also keep my weight healthy (BMI 22-23) and do exercise, like walking, running and mountain biking.
I’m a menopausal woman who don’t have an uterus (hysterectomy many years ago) and going on topical estradiol also helped.
Good luck!