Earth abides. It's post apoc(pandemic kilos off people) but also deals with the practicality of surviving in /out/ situations. There's 3 distinct timelines. A few weeks before/2 years after the pandemic. 10 years after the pandemic, and then 50+(when the protagonist is geriatric) years after the pandemic, and the new civilisation is built up.(and explains how it's not anywhere near ideal because of strife presented between those last 2 time frames)
It's my favorite book, and I really recommend ppl here give it a try. Atleast listen to the first time frame on an audio book, since that's literally putting next to no effort into it.