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I believe if you have your base branch checked out and you run

gt sr

(a.k.a "gt stack restack"), it will restack all stacks that your base branch is a member of, which should be all of them. Similarly, you can then follow up with a

gt ss

(gt stack submit) to push all of the stacks which your base branch is a member of to the remote

Ah, nice, thanks. Didn't consider that the base branch is part of the stack.