Ask How to rebranding or redesigning a membership site without disrupting existing users?

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I'm planning to rebrand my membership site. I'm updating the logo and color scheme. I'm redesigning the layout for better navigation. I'm testing new features with a small group. I'm communicating changes to existing users. I'm ensuring a smooth transition. I'm focusing on maintaining user trust. I'm gathering feedback from early testers. How to rebrand or redesign a membership site without disrupting existing users?