You would be much better off posting this forum question as a new post in the forum and not just tagging on to the end of a post that is over a year old now.
You can use Wix Users API to check if the current user is logged in and from that result either have the user login and then moved onto another page, or just simply have the member moved to another page if they are already logged in.
https://www.wix.com/corvid/reference/wix-users.html
Please make a new post in this forum if you require any more help with this.