This is one of my best career tips!
My manager and I had been on the same client project for nearly two years.
And when it was time for us to roll off the client, I wanted to do something special. So I went into Google slides and made a "yearbook", with pages for each other member of the team to sign their name.
And when I presented it to him during our last daily stand up, he nearly teared up!
How do you offboard team members on a long term project?