So he’s not laying on hard plastic, metal, or wood, use a blanket, mat, or bed.
2. A favorite toy. Give him a treat every time he enters the crate to demonstrate that he is rewarded for utilizing it.
3. Consider putting a lavender diffuser near the crate. Lavender is well-known for its ability to soothe dogs (and humans). If he feels more at ease in that space, he’ll be more inclined to visit there on his own.