No good evidence says caffeine causes tinnitus, and an oft-quoted 2010 study from Glasgow even found that women drinking more caffeine had slightly less tinnitus than those drinking less. So there is no need to give it up out of fear that it caused this.
What caffeine can do is sharpen tinnitus that is already there, especially if you are sensitive to its stimulant effect. Caffeine raises sympathetic tone, can disturb sleep, and can amplify the perception of anything you are already attending to. So a heavy cup of coffee in the late afternoon plausibly worsens your evening loudness via a sleep and arousal pathway, not via the ear itself.
A reasonable experiment: keep your morning coffee. Cut anything caffeinated after noon for a week. See whether your evenings and nights feel different. If they do, you have learned something useful. If they do not, enjoy your coffee.
What does not work is white-knuckling cold turkey out of guilt. The caffeine withdrawal headache will be worse than your tinnitus.