send all my own worksheets to another account

You don't need to change your account, just change your email address:
1) Click on your profile pic.;
2) Go to "My account" ;
3) Choose "Edit";
4) Enter your password and change your email address.

Hello everyone,
Yes, you can change your email address as explained previously by @kohai. If you have further questions feel free to let us know. We'll be glad to point you in the right direction.