Reddit mentions of Radioactive Evolution: A Dystopian, Post-Apocalyptic Adventure

The following each only have one book sadly as not many books in the genre have a lot yet, some have second books coming soon.

The Game of Gods by Joshua Kern

The Great Filter by Russell Wilbinski

Advent (Red Mage) by Xander Boyce

Core Punk by Paul Bellow

First Song (Anthem of Infinity) by Blaise Corvin

This next one has three books but it also has a lot of sex, the story is good if you can get past that or enjoy that sort of thing.

Apocalypse Gates by Daniel Schinhofen

This next one is post-apocalyptic but the world ended a long time ago, it has 2 books. I should note that the "system" aspect is new in the book, it didn't happen when the world fell.

Radioactive Evolution by Richard Hummel

Lastly an honorable mention because while you wouldn't think it's post apocalyptic from the description it absolutely is which may be a spoiler but not big one. Again those the world ended a long time ago. It has three books.

Threadbare by Andrew Seiple

Given time i could probably think of a few others but these were just the ones that came to me the quickest and ones I can say having read them are all good. I also avoided the ones you mentioned or other people have already recommended. Hope this helps!