Jill Lepore in The New Yorker describes two essential structures for "plague novels": stories set during a time of sickness and quarantine, and those "set among a ragged band of survivors." She cites many, beginning with The Last Man (1826) by Mary Shelley, that end with a portrayal of society having regressed.
And that, in the modern plague novel, is the final terror of every world-ending plague, the loss of knowledge, for which reading itself is the only cure.
Maybe today is the day, then, to recommend Station Eleven by Emily Mandel. In this plague novel we do experience the lock-down quarantine and also the time after. In the after times, a man curates a archive of artifacts in the airport in which he and others live, and a band of musician and actors roam the land putting on Shakespeare's plays, because "survival is insufficient." Mandel gives us a hopeful ending.
If there are again towns with streetlights, if there are symphonies and newspapers, then what else might this awakening world contain? Perhaps vessels are setting out even now, traveling toward or away from him, steered by sailors armed with maps and knowledge of the stars, driven by need or perhaps simply by curiosity: whatever became of the countries on the other side?