That which stays in our thoughts for long time have some significance. What we can do is introspect, question it, turn the page again and again and lastly, not the least, meditate on the same.
At the end, we get freedom from the same repeated thoughts. Many a times, solution gets marred in our thought cycle. Hence, take only one staying thought and work on it.
Golden rule to get freedom is, stay as good human with more and more of synergy.