To find the most popular pins from a user with thousands of pins and over 10 million monthly views, you can visit their profile on Pinterest and sort their pins by engagement. Look for pins with high likes, comments, and repins. You can also use third-party analytics tools, such as Tailwind, which provide insights into pin performance, including the most engaged pins. Additionally, explore the user’s boards, as popular pins are often grouped together, making it easier to identify trends and favorites.