MTL - My Parents Are Omnipotent - Chapter 3 that's a good guess

Billions of people around the world were transmigrated to the game world of “Shining Era.” Everyone became lords and possessed their own land.

They recruited troops, gathered resources, occupied mines, attacked cities and built up their empires.

In this world of lords, the most important resource was the troop lairs where they could recruit troops.

However, the potential of these lairs was fixed. If anyone wanted to obtain a top-level troop, they could only do so by defeating powerful wild troops and occupying their lairs.

However, Richard discovered that he could actually improve the level of troop lairs directly.

From then on, various powerful troops were groomed by him.

When the other players were still leaping with joy from obtaining a high-level troop, behind Richard were a Desert Pharoah, a Demonic Scorpion King, a Mechanical Giant, a Demon Baron, a Blood Archduke, a Five-colored Evil Dragon, and a Fallen Angel.

From that day on, a prosperous and dazzling oasis city was established in the desert. As for Richard, he became the ruler of the desert.

Earth Online – a virtual MMORPG that takes place in the future year of 2190 – a game that everyone will bet their futures on. Set in a map that is ten times the size of real-world Earth, players battle for supremacy in the first game to feature personal adventure, territory construction, and grand warfare. For every death you experience in the game, your level would drop back to zero. Ouyang Shuo, an above average player, suffered the ultimate betrayal. For merely a piece of equipment, his sworn brother betrayed and backstabbed him. This time, after he reincarnated in the game, Ouyang Shuo swore to exact vengeance.

However, in an unexpected turn of events, Ouyang Shuo found himself back five years before the betrayal – right before the launch of Earth Online. This time, armed with the knowledge from his past life, Ouyang Shuo would venture upon a new path.

How to perfectly complete quests? What historical battle maps would appear? How should one build up their territory? Utilizing the experience from the predecessors of his last life, Ouyang Shuo makes his bid for the top against all odds. Follow his journey as he seeks to lord over the world!

A different kind of tale that blends historical characters and virtual reality gaming, with heavy emphasis on kingdom building and warfare.

- Description from Novelupdates

Corporate slave Alexander dies with only one regret—not finishing the fantasy novel in his hands. Fate has a twisted sense of humor when he awakens as Alexander Flamingo, the perverted villain destined to be expelled and killed in that very story!Armed with complete knowledge of the original plot and a mischievous “Harem King System,” Alexander plans to rewrite his fate. No longer the one-dimensional pervert of the novel, he'll use his future knowledge to manipulate heroes, seduce heroines, and rise from disposable villain to the true mastermind of this world.The system grants him power through every relationship he builds—but can this calculating reincarnator use his second chance to avoid his predetermined death and become the ultimate Harem King? One thing's certain: this story won't follow the original script.