One way to track your prospect's interests is by keeping a record of their interactions with your company. This can include notes from meetings or calls, emails exchanged, and any other forms of communication. Additionally, regularly checking in with the prospect and asking about their current priorities and needs can help you stay updated on their interests. Utilizing a CRM system can also assist in organizing and tracking this information. Keeping an ongoing record of your prospect's interests will allow you to tailor your approach and better cater to their needs.