Tips to Upgrade Home
On that screen there is Back Mountain, the only location you can enter. Here you need to play “happy farmer” to gather them.
If you increase the level of the Back Mountains, then you will get access to rare resources too.
You need to gather both stone and wood materials from the Back Mountain of Homestead.
If you have an old save file, I’d recommend you to use the old save file, there’s a way to gather the materials with exploit.