I currently have a custom Drupal theme that is working well with Drupal 10.4.3. I am planning to upgrade to Drupal 11, as it appears to be the stable, long-term supported version.

What is the recommended process for upgrading a theme from Drupal 10.4.3 to Drupal 11?

For context, I previously migrated my site from Drupal 7 to Drupal 10. During that transition, I had to rewrite the theme from scratch due to major architectural changes. I am hoping that such a complete rewrite will not be necessary when upgrading from Drupal 10 to Drupal 11.

Any guidance or best practices would be appreciated.