Expand your home by upgrading the Flame Altar to increase your protection range. Upgrading the Flame Altar requires a Shroud Core, which is aquired by defeating boss enemies. Increasing the range will give you more space to build in.

You can expand your home in different ways. Upgrading the Flame Altar increases the building range. Strengthening the Flame increases your protection against the Shroud and allows you to build more bases. Build a second Flame Altar in the outer wilds anywhere you'd like.