You can also try motivation. Why do you want to achieve this and focus on that.
Keep going, your body and mind will adapt to the changes.
I ALWAYS find time and energy for things that I have a passion for. I think finding this challenging and having no energy to do it is a part of a bigger problem. My advice is try to find the joy in things and that should bring about a second-wind. If the joy isn’t there- you’re not in the position you’re destined to be in.