Go to Valheim Nexus and start downloading mods. I am not sure how many are broken after the patch but there is a mod that allows you to spawn in other peoples builds and perform massive terrain editing, BuildShare. After I completed the main game I played another couple months just exploring and using that mod to drop castles or bases all over the world. what is cool is you can spawn in someone's pre built castle and tear it down or modify it how you want and it helps to learn more intricate builds.Another amazing mod is Epic Loot. it turns the item drops into Diablo style loot and it is amazingly well balanced.