How do you make your mythie grow in jumpstartcom?

To make your Mythie grow in JumpStart, focus on completing quests and engaging in mini-games, which help earn experience points and rewards. Additionally, nurturing your Mythie through feeding, playing, and training will enhance its growth. Regularly participating in events and challenges can also contribute to your Mythie's development. Finally, explore the environment to discover new activities and items that can boost your Mythie's growth.