Just keep tweaking - results are different for everyone - GF and I started at the same time, basically the same diet and we had very different responses. Also, for most people it seems to take 3 - 4 weeks (hence the 21 and 30 day challenges).
I can't quote the science on this but the energy seems to come from a reduction of inflammation and converting from primarily carb burning to fat burning.
Carb burners have lots of energy ups and downs, whereas fat burning has more even energy which most people generally describe as higher energy. Some people experience something called carb flu, which seems to be a combination of carb withdrawal and/or detox.
It was a full three weeks before GF had a noticeable difference in energy - coincidentally, she was not sleeping as well, but after 3 weeks her sleep got better and her energy got better - not sure if either was causal.
Anyway - stick with it a while longer if you can and continue to look for changes, including body comp and any inflammation changes.
All the best
| current weight: 528.0