“my personal bradycardia and chronic fatigue”

I am a male in my mid-30's. I don't smoke. I drink alcohol almost daily. I exercise almost every day and try to eat whole foods, not the grocery store but the lower case whole foods. I am 5'5.5". I weigh 136ish lbs and am athletic and active. My question is regarding my slow resting heart rate.
My resting heart rate typically fluctuates between 39-45. I know that this can get a good sign that my heart is strong enough to pump the blood my body needs while doing so at a slower rate. I'm confident I have had a slow heart rate my entire adult life, maybe longer. My father has bradycardia as well. My question revolves around my slow heart rate and how it may relate to my constant fatigue. I seem like I am always tired a never 'want' to do much, though I work, raise 2 young children, exercise and help maintain my household daily. I just seem tired all the time. I'm curious as to how much of this may be attributed to my slow heart rate and what I may be able to do, preferably naturally, to boost my energy levels and potentially resting heart rate, if that is in my best interest. Thanks.