I want a game that's simple, economy mostly, managing resources and some war and conquest.

While I respect a lot of RTS games for their extreme complexity, I am not the target audience.

I don't want to play 8 hours a day, just to set up a simple army, and start justifying war for like 300 in game days....

I need something more casual, manage a colony, make sure your citizens are fed, and happy, build trade routes with other countries/kingdoms, or build an army to raid or annex them.

Something like kingdoms reborn. It's a simple bite sized game compared to HOI4 or Victoria 3.