Is there a way to change or update your user name and still keep everything in your account the same?

You can change your username here: https://similarworlds.com/profile-edit

However, please note that every time you change your username, the time required to be able to change it again will increase.

I'd suggest you choose a username that you'll be happy with for the long term.

I was forced to do it early on the first year. They remapped the allowable characters.

Was De_Wayfarer
Remapped to:

De0Wayfarer
Yuck 👆

Account settings then edit profile