Changing the artist name is not as easy as you think. The stores would create a completely new artist page, meaning that you would lose the current one and lose your monthly listeners and followers. It would also make it more difficult for your listeners to find your releases.
If you still want to do it, here's what you have to do:
No previous releases? In this case, you can simply create a new account with another email in the app and use it to upload your new releases.
Already released music? In this case, you will also have to create a new account in the app and upload the releases again. Remember to use the same ISRC codes as you already have for each one of the tracks (you can find them in the app) - that way you will keep the streams.