There is another non-obvious problem (even a rake), which consistently brings losing weight.

Some form of self-sabotage. Lack of flexible diet. We all know perfectly well that not only the daily calorie content is important, but also the weekly one. And that you can vary your consumption from day to day, for example, set the bar higher on a training day. Or raise on the weekend (Attention! Do not cancel, but raise!). Or abuse it in Sabantuy and subtract from the next day or two.