Seeking Any long management games something like Stellaris or CIV but 18+?

[Connerlee]

Anything with resource management, and that could take like upwards of 20 hours to beat.

 

[Pretentious Goblin]

For strategy games that don't focus on combat, all I can think of are these, I'm not familiar with them and they're text-based.

https://f95zone.to/threads/fort-of-chains-v1-8-3-0-darko.63726/

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https://f95zone.to/threads/xxxivilization-ch-2-5-fix4-hw21.9224/

For combat-focused strategy-RPGs, there are these.

https://f95zone.to/threads/daibanchou-big-bang-age-alicesoft.6166/
https://f95zone.to/threads/venusblood-hollow-international-v1-0-3-ninetail-dual-tail.100855/ (several other games in the series)
Sengoku Rance

 

[crnisl]

There's a bit of simple but fine management in the games of Pyorgara.
Breaking the Princess
Soldier's Life

Defiler Wings maybe is to your liking.