Hello @Wonka, thank you for reaching out!
We advise you to reduce the amount of light sources, npcs and even building pieces, if possible, as the crashes are in many cases caused by high amounts of placeables in the same area, since the single player client has trouble handling the same load as the online client, especially on console.
Disk space doesn’t factor as much as disk speed, so having a SSD is usually helpful in mitigating this type of issue. There’s also a known issue that’s being looked into where having the Admin Panel enabled aggravates performance issues.
That being said, our developers are looking into further improving the console experience, so all feedback is helpful!