Instead of doing a workout where all your repeats are the same distance, do ladders, where you start short, get longer, and then come back down. A typical ladder when doing repeats at 5K race pace would be repeats of one 400-meter lap, then two laps, on up to four laps, before coming back down one lap at a time to finish with a 400-meter repeat. Ladders are a good way to ease into a workout physically and mentally. On the way back down, you could run the last couple repeats a bit faster to practice picking up the pace while already very tired.
A potential drawback to ladders is that they get mentally easier once you’re coming back down. In races, of course, there’s no such easing of the mental strain as the finish approaches.