Assuming you've got your sleep/lifestyle issues in order, the lack of energy is most likely due to your caloric deficit. Training at a high intensity is extremely difficult if you're operating under a caloric deficit. I'm assuming you intermittent fast every day? You might try dropping it in only a few times a week on rest days. If you're IF'ing and restricting calories daily you shouldn't be doing much more than some simple strength training and low level cardio like walking. Limit the IF, train relatively low carb, carb refeeds PWO. Should set your training and weight loss straight.