Recently, I noticed a change: some Google accounts are beginning to support changing/adjusting the main email display name settings (whether this feature is available depends on the account).

Simply put:
If your account supports it, you can adjust the primary display method of your email in Google Account settings. The original email will remain as a backup/alias, without affecting normal login and usage.
This essentially provides an opportunity to "reorganize your email identity." If you're unhappy with your previous email name, check if this feature is available.
If your account doesn't have the option, it means it's not your turn yet; not everyone can use it.
Access point (based on the actual account page):