Reptile enrichment looks nothing like dog or cat play, and it helps to reset expectations from the start. A fire skink will not fetch or chase a toy; instead, enrichment for this species means designing an environment that lets it perform the natural behaviors it is wired for, chiefly burrowing, foraging through leaf litter, and exploring varied terrain. The product you are really buying into is a richer habitat rather than a plaything.
The goal of enrichment is both physical and psychological health. A skink that can dig, hunt, and investigate stays more active, maintains better body condition, and shows fewer signs of stress or boredom such as constant hiding or repetitive pacing along the glass. Meeting these instincts is as much a welfare requirement as correct temperature.
Novelty and choice are the underlying principles. Periodically rearranging decor, introducing a new texture, or changing where food appears keeps the environment from becoming static and predictable. Giving the skink multiple options, where to bask, where to hide, where to dig, lets it make decisions, which is itself enriching.
A word of caution shapes everything that follows: a shy species needs enrichment that respects its nature. The most effective additions tend to provide cover and complexity rather than force exposure, so the skink can explore on its own terms. Enrichment that leaves the animal feeling exposed usually backfires into more hiding, not less.