If you were to volunteer abroad, I would highly recommend doing it with Project Trust. However, here are some other organisations you can look into when thinking about volunteering.
Involvement Volunteers International
This charity was founded in 1989 and their aim is to "Educate, fight poverty, improve health and empower change through sustainable volunteer work in developing communities abroad."
find out more: https://www.volunteering.org.au/
Globalteer
Globalteer offer 1-12 week placements in South East Asia and Latin America. They have a wide variety of different projects which include animals and conservation and also working with children so you can find a project that suits you.
find out more: https://www.globalteer.org/volunteer-abroad/
Global Vision International
GVI offers placements in Africa, Asia, Europe, Latin America and Australasia. Like Globalteer, they offer a range of different projects like different types conservation and community development
find out more: https://www.gvi.co.uk/volunteer-abroad/
International Volunteering HQ
With IVHQ, you can volunteer in one of over 50 countries for 1-24 weeks. Whether you are interested in teaching, medicine, construction or conservation, you can find a project that you are passionate about.
find out more: https://www.volunteerhq.org/charity-work-abroad/