Nothing stopping you from setting out on your own.
There is limited worlds, but they aren’t static, the number of worlds (and which worlds) will change. The surface of the planets can (and will) also change. There’s someone in alpha right now cutting down a mountain (literally). There’s also a system for planets dying, and being restored.
Just “finished” Factorio’s new Space Age expansion. Just a few more achievements to collect, but I need to start a couple new runs for those so I will be continuing on with that until Path of Exile 2’s early access in December.