Elisabeth Muyinganyiki, a 19-year-old Rwandan child rights, gender justice, and environmental activist, demonstrates the transformative impact of investing in children's meaningful participation. She joined Children's Voice Today (CVT) grassroots groups at age 13 and became actively engaged in its programs by age 15. Through CVT's training, mentorship, coaching, and leadership opportunities, Elisabeth developed strong skills in child rights advocacy, leadership, public speaking, and civic engagement. She progressed from a grassroots group member to a confident youth leader and advocate influencing discussions on children's rights, climate justice, and youth participation at local, regional, and international levels. Today, Elisabeth actively promotes children's rights, protection from violence, and meaningful participation in decision-making processes. She works to amplify the voices of children and young people, particularly those often excluded from important conversations affecting their lives. Her advocacy extends beyond Rwanda through engagement in regional and global initiatives focused on child rights, climate action, social justice, and youth leadership. Passionate about climate justice, she advocates for recognizing climate change as a children's rights issue, emphasizing its impact on children's health, education, safety, and future opportunities. A significant achievement in her journey was serving on the Children's Advisory Committee, where she contributed to the development of the Kigali Declaration on Working Children and Youth during the Global Gathering on Working Children held in Kigali in 2023, Also contributed the to the development of general comment 26 (GC 26) United National Convention on the Child rights. Elisabeth continues to engage leaders, institutions, and communities in promoting child participation and building sustainable solutions. Her story highlights how sustained investment in mentorship, capacity strengthening, and leadership opportunities can empower young people to become influential advocates and agents of positive change.