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As someone said, make the game data-driven is a good first step but I will say, also have some sort of way to add additional game logic. For C++ games, lua is really easy to embed the interpreter in your C++ binary, read in the files from a directory (like /mods) with the C++ filesystem api new in C++17, and it's very easy to use SoL to write an API for lua specific to your game. Many games use lua in this way and it's probably the most common mod path setup.
I have done this, funny-enough, for my own mod for Valheim. You can look up the patching system here: https://github.com/RandyKnapp/ValheimMods/tree/main/EpicLoot/Patching
If you're using C#, I've got a library designed for easy datadriven moddability. It's heavily inspired by Rimworld's Def system. Still in development - it tends to get work done on it when people ask for it - but it's currently being used in Ascent of Ashes and I'm hoping to expand that.
ie: for unreal, https://github.com/rdeioris/LuaMachine