Novels like Apocalypse Spear

All share System Invasion and Apocalypse

Secret Menu Survivor
4.42
Also Post Apocalyptic and Survival
Unbound Ascension – Classless (Book 1 - Coreless is complete at ~330k words)
4.41
Also GameLit and Post Apocalyptic
Thorn's Edge: A System Apocalypse LitRPG
4.65
Also Contemporary and LitRPG
Virus: Origin of Blood
4.49
Also Post Apocalyptic and GameLit
Teresa Of All Trades (Books 1-3 Complete)
4.52
Also Contemporary and Survival
The Protectorate
4.40
Also Contemporary and Post Apocalyptic
Worldfall: A Broken Bow【LitRPG+Progression】
4.12
Also Post Apocalyptic and GameLit
The Gift of Loot
4.59
Also GameLit and Survival
Imma be a speedster
4.51
Also Post Apocalyptic and GameLit
Progenitor's Path - - (Book 3 complete)
4.25
Also Post Apocalyptic and Survival
Unsated
4.43
Also Post Apocalyptic and GameLit
Death March: An Apocalyptic LitRPG
4.47
Also Post Apocalyptic and GameLit