If your pixel is already installed and working, you don’t need to create a conversion event just to retarget people who visited a specific page. Facebook (Meta) tracks PageView events by default on every page where the pixel is present.
So if you retarget those visitors, you can just:
Go to Audiences in Meta Ads Manager.
Click Create Audience → Custom Audience → Website.
Choose “People who visited specific web pages”.
Enter the URL or part of it (like /thank-you or /pricing) you want to retarget.
You can even set a time frame like “in the past 30 days.”