I personally concluded that long term keto didn't work for me as well. Just by noticing the effects over time.
Ultimately I think any diet which becomes ideological isn't a good system. Humans used to eat locally and with the seasons.
Discussion
Great insight re diet. Everyone is different. Keeping track of your own responses to food is the most important “diet” skill
Eat with the seasons and the sun. Carbs grow with the sun so summer is when I eat more of them. I tend more toward keto and fasting during the winter as my ancestors would've done. Keto is a hormetic stress on the body. Doing it 24/7/365 is an eating disorder, and this study tells us disordered eating is bad for humans.