There is no such thing as adaptation to ketones. You produce them every night and during long training whether you want to or not.

The only thing worth doing is removing dependence on carbs.

But at the end of the day carbs are a great energy source, when taken in appropriate amounts and the right times.

So fuel with carbs around training, eat low carb outside of training if you want to, you will produce a few more ketones, your health will improve if the quality of the diet is high and you will feel better for it.

Trying to adapt to ketones is like swapping one fuel for another, it doesn't make you any more metabolically flexible, it just swaps glucose for ketones.