The most effective ways to protect orangutans are surprisingly direct:
Support conservation groups that patrol forests and rescue/rehabilitate displaced orangutans: the International Animal Rescue, Borneo Orangutan Survival Foundation, Sumatran Orangutan Society, and The Orangutan Project.
Reduce consumption of ultra-processed foods. Global demand for palm oil drives deforestation, and ultra-processed foods require industrially-produced crops, including palm oil, grown at a massive scale.