One thing some people don't know is there is a ton of really cool mods - https://mods.factorio.com/
You can see some of the most popular at - https://mods.factorio.com/downloaded and https://mods.factorio.com/trending
You can see some of the most popular at - https://mods.factorio.com/downloaded and https://mods.factorio.com/trending
I "completed" the game using a lot of these and thoroughly enjoyed it but it was incredibly addictive.
Bobs Mods is a good "new game plus" after beating the base game.
Space Exploration adds an amazing amount of depth, but it's somewhat intimidating.
FNEI is a very useful recipe browser.
Recursive blueprints are incredibly cool, but also hard to reason about. Fun to try though!
Factorissimo add recursive space (buildings that contain more space inside than their footprint).
If you're into really detailed and complex factories, Industrial Revolution might be for you.