That's a very broad question. Since you're asking, I assume that you do not enjoy high energy all day.
First of all, the cause for low energy may be mental or it may be physical.
Don't assume that because you feel tired in your body, the root cause is obviously physical. Long-term therapy helped me a lot. I also meditate semi-regularly, and try to maintain a good network of friends I see regularly. (AND, VERY IMPORTANT ... exclude negative people, if necessary family, from my life!)
Moving on to the body, it sounds like you're asking about "good health." Here's what works for me (has evolved over time):
* Early morning sun exposure, ideally a run.
* Keeping a healthy weight through intermittent fasting and low-carb eating.
* Regular resistance training - squats, pushups, pullups, can be done at home.
* Did I mention low-carb eating? Say no to lunchtime rice or noodles. Or perhaps say no to lunch.
* Very limited alcohol. No recreational drugs.
* Feeding that gut microbiome with lots of prebiotics and probiotics.
* Using a standing desk for about half the day.
* Avoid most meds except in case of emergency, i.e. stay off the prescription cascade.
* Regularly getting a good night's sleep, again without using meds. I recommend a weighted blanket.
I do drink coffee and tea, which are both reputed to be healthy, and I eat lots of other delicious cooked food. (Often without the rice/bread/noodles.) I am highly skeptical of raw-food diets - they seem completely anti-evolutionary.
Good luck!