Best way to get more energy without caffeine or sugar?

Typical day is 530 to about 3–5. Granted once in the office not a whole lot goes on exactly. Depends on the day.

Why am I so tired? I hate being tired and dragging. It is not all the time though. What can I be drinking(I drink good amount of water) eating or taking to help me?

I also lack motivation a lot to do stuff once I’m off work. Suggestions?