Mesauring the success of your personalization experience can vary from industry to industry. However, there are a few of the key performance metrics that you can consider to track and analyze the effectiveness of the personalization experience on your website as explained below:

Revenue generated
Personalization can impact many metrics of your business and one of the most important metrics is revenue. Calculating the revenue generated, which includes items purchased from an online shop, bookings made on a travel portal, and the total reading time on a blog post, can determine the overall success of your personalization efforts. It can also help you compare the average revenue for new customers or returning or loyal customers to see if the amount increases or decreases based on different segments of audiences coming to your website.

Conversion rate
Conversion rate is a key way to measure any kind of business success, and it’s especially useful when analyzing your personalization metrics. The conversion rate is the percentage of visitors who actually completed a goal on your website. This data lets you understand whether customers are really interested in the personalized experience you offer and whether your visitors are finding what they're looking for on your website by analyzing clicks and purchases made through key CTAs. By tracking the percentage increase or decrease in conversion rate over time, you can decide whether you need to change personalization tactics like providing extra reward points or making the checkout process smoother, or designing simpler and easier to fill forms for targeted visitors.

Traffic source
In addition to visitors' count and conversion rates, it is essential to understand which traffic source is driving the most traffic to your personalized experience. The specific traffic source that a customer is visiting from such as paid, organic search, social media, or direct can be used to dig into your audience's behavior, interests, and interaction pattern with your web pages and can be used to produce better personalized content. This can in turn help improve visitors' experience and conversion rates without spending too much on advertising campaigns.