Believe them. “I do not want more stuff” is useful information, not a challenge to find a smaller object.
Start with a service or experience: dinner, a shared class, a ride, a photo print, or help with a task. If you still want an object, keep it small and easy to pass on. The pocket-hug star can fit a bag or desk, but only if the friend likes sentimental objects. A yellow star friendship gift is more visible and should not be sent as a surprise when they are actively decluttering.
Make the gift easy to refuse
Say, “If it is not your thing, no explanation needed.” Do not attach a story about how much work you did or expect the recipient to display it.
Read How to Choose a Keepsake for a Friend and Gifts for a Friend. Product availability and return policies belong to the current Amazon page.