Reptiles do not interact with toys the way a dog or parrot might, so enrichment for an African fat-tailed gecko means something different from a basket of playthings. The goal is to give the animal opportunities to perform its natural behaviors: exploring, hunting, hiding, digging, and investigating changes in its environment. An enriched enclosure is one that rewards curiosity and supports instinct, not one cluttered with novelties the gecko ignores.
It helps to understand the species' ethology. These are nocturnal, terrestrial geckos that in the wild move across a ground-level world of leaf litter, crevices, and burrows under the cover of darkness. Meaningful enrichment therefore happens largely at the substrate level and during the evening hours, and any addition that ignores those facts is unlikely to be used.
Effective enrichment also respects the animal's strong need for security. A fat-tailed gecko that feels exposed will not explore, so paradoxically the most enriching enclosure is one rich in cover. Plentiful hides and clutter give the animal the confidence to venture out and engage with everything else you provide.
Finally, enrichment is an ongoing practice rather than a one-time purchase. Periodically changing the layout, introducing new textures, and varying how food is presented keeps the environment novel. The aim is a habitat that stays interesting over a fifteen-to-twenty-year lifespan, not a static display.