This is a small mod that makes the techs cost to gradually increase with Eras.
It's based of a bit of code by alpaca that I have used in some of my mods for Civ5.
Unzip it to "..\Documents\My Games\Sid Meier's Civilization VI\Mods"
It should create a folder named "Slower Tech"
Go in "Additional Content" and activate it by checking the box near "Activate Mod" then click "Back" and launch a game.
It's based of a bit of code by alpaca that I have used in some of my mods for Civ5.
Unzip it to "..\Documents\My Games\Sid Meier's Civilization VI\Mods"
It should create a folder named "Slower Tech"
Go in "Additional Content" and activate it by checking the box near "Activate Mod" then click "Back" and launch a game.