Our bodies build tolerances to every stimulant after a while. I’m sure you’ve noticed that it might take two cups of coffee to get the same buzzy effect that one gave you before. There are plenty of people who only drink coffee to drink it, because they’ve gained a dependency.
If you really want energy that lasts, consider exercising. This will be a slow and painful transition(not gonna sugar coat you). But, when I went from crushing energy drinks and coffees to running I was able to feel the benefits in the workplace.
It’ll take a while and this is a kind of New Years Resolution type resolve, or maybe you’re just sick of depending on coffee like me. It can be quick and painless as well.