To find the traffic sources of a website, you can use some of the following methods:

1. Check Google Analytics: If the website uses Google Analytics, you can view some basic traffic source data in the Acquisition section. This will give you an overview of the different channels sending traffic to the site.

2. Use SimilarWeb or SEMrush: Both these tools offer insights into a website's traffic sources, including organic search, paid search, social media, and referral traffic.

3. Look at the Website's Referral Traffic: By checking the Referral section in Google Analytics, you can see which websites are linking to your competitor's site, potentially driving traffic to them.

4. Analyze Social Media Activity: Look at your competitor's social media profiles to see which platforms are generating the most engagement and traffic for them.

5. Check for Paid Search Ads: Use tools like SEMrush or Google Ads to see if your competitors are running paid search campaigns that are driving traffic to their site.

By using these methods, you can gain valuable insights into your competitor's traffic sources and use that information to improve your own website's traffic strategy.