Create an audience based on previous URL visits

@katherineke You can use Analytics audience to achieve such kind of use cases. 

Document link: https://experienceleague.adobe.com/docs/core-services/interface/services/audiences/audience-library.html?lang=en

If you want to achieve this use case via a Profile script then you need to stores the value of user visited page in last 30 days. I am just giving it a try, not sure if this will work exactly or not but you may tweak it. 

// Define the target URL and the timeframe (30 days in milliseconds)
var targetURL = "https://jobs.dropbox.com/teams/engineering";
var timeframe = 30 * 24 * 60 * 60 * 1000; // 30 days in milliseconds

// Get the current timestamp
var currentTime = new Date().getTime();

// Check if the user has visited the target URL in the last 30 days
var lastVisitTimestamp = localStorage.getItem("lastVisitTimestamp");

if (lastVisitTimestamp) {
lastVisitTimestamp = parseInt(lastVisitTimestamp, 10);
}

if (lastVisitTimestamp && (currentTime - lastVisitTimestamp) <= timeframe) {
// User has visited the target URL in the last 30 days
// You can now set a profile parameter or trigger an action for this user
// Example: Set a profile parameter
mbox("profile.parameters.visitedJobsPage", "true");
} else {
// User has not visited the target URL in the last 30 days
// You can set a different profile parameter or take other actions as needed
// Example: Set a different profile parameter
mbox("profile.parameters.visitedJobsPage", "false");
}

// Update the last visit timestamp to the current time
localStorage.setItem("lastVisitTimestamp", currentTime);