One of the best indicators of interest in a lead is their level of engagement with your messaging and content. If a lead consistently opens your emails, clicks on links, and responds to calls-to-action, it is likely they are interested in what you have to offer. Additionally, if a lead actively seeks out more information about your product or service through means such as scheduling demos or requesting additional materials, it can also be a sign of interest. It is important to regularly track and analyze a lead's behavior to accurately gauge their level of interest.