The only way I'm extending my content is through mods. I finished around the same time, 200 + hours.

Only one mod that I can think of is almost like a complete overhaul. It's called, "Do or Die... ". Great Fun! except sometimes in order to actually have a stable game, you have to jump through firey hoops in order to have them install properly.

Once that's done, progression is slower due to it's increased difficulty. If I were to guess, it will take 300hrs.

If basing it on the Ark Survival success they have with world changing mods. I imagine if more mod workers were attracted and the installation made simpler, then the game can be extended nearly indefinitely. Depending on the extra content from the mod making community.