Ask yourself questions

Think about what you've got so far, and start asking questions. Write them down! Ask yourself about…

… the connections you've made and what those connections imply. "What do the Ustrina know about this ruin? Why do they stay away?"
… any apparent contradictions. "If the site is intact and fully visible, but close to town, why has no one explored it?"
… fuzzy details. "It was a workshop, but what type of work?" "Who was this Forge Lord, specifically?"
… causes and reasons. "What melted the statue?" "Why did they build this place here, specifically?"
… how it's changed over time. "How did it fall into ruin?" "Who inhabited it next? How did they change it?"
… the denizens who dwell here, their motives, and how they interact with each other. "What does the hagr want?" "How do the bandits keep the ghosts at bay?"
… timing. "How long have the crinwin been here?" "How long was the barrow sealed before Winoc opened it?"
… anything else that feels important.