How to easily transfer your reddit subscriptions to a fresh account using scripts

1. With your old account open https://old.reddit.com/subreddits/mine/ and run (copy paste + enter) the following code in the browser console. This will simply output urls of all your subs in chunks of 100 (because the url mustn't be too long). Temporarily copy paste the urls into some empty text document. In order to do that, use right click, then copy link on the url, don't just select the text (because it is truncated).

    (function () {
        var multiredditElement = document.querySelector(".subscription-box ul>a");
        if ( multiredditElement ) {
   
            var href = multiredditElement.getAttribute("href");
            var subreddits = href && href.split("/r/");
            if ( subreddits && typeof subreddits[1] !== "undefined" ) {
                var a_subreddits = subreddits[1].split("+");
                while ( a_subreddits.length ) {
                    var hundred = a_subreddits.splice(0, 100);
   
                    console.log( "https://old.reddit.com/r/" + hundred.join("+") );
                }
            }
        }
    })();
   

2. Clear all reddit cookies/storage, close all reddit tabs and get a new IP (via your router interface or just power off the router). If you skip this step reddit WILL connect your accounts (internally) and continue profiling you and you also risk getting punished for ban evasion.

3. Create a new reddit account now and log in, then go to each url you received in the first step and run the following code in the browser console. This will simply do a click on each subscribe button so you don't have to. You will get notified when you're subbed to all subreddits of the chunk.

    (function () {
        var a = document.querySelectorAll(".subscribe-button a.add.active");
        var i = 0;
        var int = 0;
        int = setInterval(function () {
            var el = a[i++];
            if (!el) {
                alert("done subscribing to " +(--i)+ " subs");
                clearInterval(int);
            } else {
                var sub = el.parentNode.getAttribute("data-sr_name");
                console.log("subscribed to " + sub);
                $(el).click();
            }
        }, 500);
    })();
   

4. Success! You've got a fresh identity with all your subscriptions.