The success of the metaverse platform depends on the alignment of the digital avatar with the needs of the user. This study delves into the underlying mechanisms of digital avatars to understand how they can be supported to meet the psychological needs of users and thereby enhance stickiness. Through the logical framework of "User need→ Digital avatar features→ Affordance→ Behavior", this paper puts forward theoretical hypotheses and verifies them through study 1 (pre-experiment 1, n=112; experiment 1, n=312): (1) digital avatar features (social interactivity, co-creativity, and meta-mobility) promote user stickiness through psychological ownership, and psychological ownership acts as a mediating mechanism, and (2) context-driven self-construal moderates two stages before and after the generation of psychological ownership: social interactivity and co-creativity (meta-mobility) are easier to motivate the psychological ownership of dependent (independent) individuals (stage 1), and independent individuals who generate psychological ownership are more likely to generate user stickiness (stage 2). Furthermore, study 2 used a situational experiment using concurrent randomization (pre-experiment 2a, n=125; pre-experiment 2b, n=158; experiment 2, n=346) to verify the causality of the mediating effect. These findings provide valuable insights for digital businesses to capitalize on the technological advancements of the metaverse and enhance user-centric practices.