After a lot of research on the Wix Velo forum, I discovered the members-wix API, at the moment it is having problems, which results in looking for functions in the users-wix API, but it is deprecated, which hides functions on the site the fleece making access to information difficult. However, after copying a migration function from users-wix to members-wix, along with members-wix authentication, it worked perfectly, I also want to thank Mosh Feu for help https://stackoverflow.com /users/863110/mosh-feu, which helped me understand and improve this code.

import { currentMember } from 'wix-members';
import wixLocation from 'wix-location';
import { authentication } from 'wix-members';
// NOTE: This example uses the new wix-members.currentMember.getMember()
// function, which replaces wix-users.currentUser.
// See the function description for more information, and
// line 36 for the deprecated example.

// ...

currentMember.getMember('FULL')
    .then((member) => {
        // Replaces currentUser.id
        const id = member._id;

        // Replaces currentUser.loggedIn
        const loggedIn = member ? true : false;

        // Replaces currentUser.getEmail()
        const loginEmail = member.loginEmail;
        const contactEmails = member.contactDetails.emails;
    })
    .catch((error) => {
        console.error(error);
    });

currentMember.getRoles()
    .then((roles) => {
        // Replaces currentUser.role and currentUser.getRoles()
        return roles;
    })
    .catch((error) => {
        console.error(error);
    });

// NOTE: This example uses the deprecated
// wix-users.currentUser object.

import wixUsers from 'wix-users';

// ...

let user = wixUsers.currentUser;

let userId = user.id; // "r5cme-6fem-485j-djre-4844c49"
let isLoggedIn = user.loggedIn; // true

user.getEmail()
    .then((email) => {
        let userEmail = email; // "user@something.com"
    });

user.getRoles()
    .then((roles) => {
        let firstRole = roles[0];
        let roleName = firstRole.name; // "Role Name"
        let roleDescription = firstRole.description; // "Role Description"
    });

user.getPricingPlans()
    .then((pricingPlans) => {
        let firstPlan = pricingPlans[0];
        let planName = firstPlan.name; // "Gold"
        let startDate = firstPlan.startDate; // Wed Aug 29 2018 09:39:41 GMT-0500 (Eastern Standard Time)
        let expirationDate = firstPlan.expiryDate; // Thu Nov 29 2018 08:39:41 GMT-0400 (Eastern Daylight Time)
    });
export async function button2_click(event) {
    authentication.onLogin(async(member) => {
        const loggedInMember = await member.getMember();
        const memberId = loggedInMember._id;
        console.log(`Member ${memberId} logged in:`, loggedInMember);
    });

    const member = await currentMember.getMember();
    const id = member._id;
    const status = member.status;
    const email = member.loginEmail
    const fullName = `${member.contactDetails.firstName} ${member.contactDetails.lastName}`;
    const userDetails = JSON.stringify({ id, status, fullName ,email });

    wixLocation.to(`https://www.url.com/?user=${encodeURIComponent(userDetails)}`);
}

1. As James mentioned, getMember return Promise so you should wait (await) or the Promise to fulfilled with the data before you can use it.
2. You are trying to concat an object (the user details) with string (the url). It's not possible in Javascript. You can "convert" the object to string using JSON.stringify.
3. Even if the object is string, the URL you are trying to redirect to is not valid e.g. www.page.com{id:1111,status:'active'}. The valid way to pass data via the url is by query params e.g.www.page.com?userDetails={id:1111,status:'active'}.
   Just to be on the safe side, encode the stringified object with encodeURIComponent().

export async function button2_click(event) {
  const member = await currentMember.getMember();
  const id = member._id;
  const status = member.status
  const fullName = `${member.contactDetails.firstName} ${member.contactDetails.lastName}`;
  const userDetails = JSON.stringify({id, status, fullName});
  
  wixLocation.to(`www.page.com?user=${encodeURIComponent(userDetails)}`);
}

(You can use the "then approach" you are using now but it's a good opportunity to use more modern API such as async/await)