How to make important unhighlighted tab more visible without conflicting with current layout and color scheme?

An email is sent out to users informing that the reviewers' comments for talk proposals are now available. The top of the page (with identifiable information blocked out) is shown below.

Next to the highlighted-white and highly visible "Proposal" tab there is a "Reviews" tab but its only indicated with small, dark-on-dark text. There's no additional visual cues that there are multiple tabs.

Whichever tab is active turns white and the other reverts to dark-on-dark text only.

Without changing or interfering/conflicting with the current committee-chosen color scheme, aesthetics and layout, what kinds of changes might make the now most-important feature on the whole page more visible i.e. impossible to miss?