Community challenge

I’m really struggling with the community challenge and I’m worried I’m not going to complete in time. It’s my first time doing one and I’ve been desperately waiting for my lemurs to breed so I can release them but I don’t know how to improve the stars? They have all green stats around 60-80% some have gold medals and silver but there’s either no stars or only 2 and I need 3 for the challenge. What can I do to improve? Thank you 🫶🏼