I was up to 4 cans of rockstar a day and quit cold turkey a month ago. The withdrawal symptoms are gone, but the low energy levels persist. I'm more interested

I was up to 4 cans of rockstar a day and quit cold turkey a month ago. The withdrawal symptoms are gone, but the low energy levels persist. I'm more interested in finding out why than going back to the caffeine. I wonder if it's the increased number of adenosine receptors, combined with lower amounts of dopamine. Some days, I take 1g of L-Tyrosine (which gets converted into dopamine) and that helps me energetic and, in a word, normal. On the days I don't, I sleep 9 hours at night and take a 3 hour nap in the middle of the day. I don't have a lot of answers right now, but I hope my low energy levels don't persist for a whole year.