Reddit mentions of MaddAddam Trilogy (3 Book Series)

I will always show up for post-apocalyptic suggestions.

Station Eleven is incredibly well written (award winning) though may be less of a "thriller" than you're looking for.

The Breakers series is technically YA but it's so well done it doesn't feel like it, plus there's a ton of action. There are NINE books in this series AND a series that continues this series.

You might also look at Margaret Atwood's MaddAddam series if you haven't already, it's brilliant and probably a cornerstone of post-postmodern apocalypse fiction.

Hugh Howey's Wool trilogy is also worth checking out.