You can see where your Pins are being shown on the Audience Insights. If you want to learn more about this, you can check our Help Center article.
Also, please note that a good way to expand your target audience is by using keywords. This helps users find content that matches exactly what they’re looking for.
Depending on the time and topic, some keywords get thousands of searches per day. You can find out which keywords are being frequently used on Pinterest in the United States (and many other locations) on the trends page here!
The Pinterest trends page is a great way to understand what Pinterest users are searching for, and can help you find the best keywords to use on your Pins.
Let me know if there’s something else I can help you with!