Honestly, I hate to break it to you but i'm almost positive that there is nothing you can do.
Even if you did, I doubt your account may exist, I've had old accounts as well since i seem to make a new one every 2-3 years or something, I've noticed that old accounts if they go inactive too long they seem to get wiped (Which is kinda bs in my opinion). I've logged into old emails that i was sure was the correct email, And it was a noob account. Even contacting support or toonslab doesnt get any reply.