With your objective of bolstering your profile for a Master’s in Educational Psychology and a scholarship, it's important to align your extracurricular and volunteer experiences with the field of interest. The details you give a strong starting point for planning relevant activities. Here are several strategies and types of volunteer work that could potentially strengthen your profile:

1. Educational Volunteering: Your past experience in tutoring and working with school children can be continued and expanded. Look for opportunities to volunteer at schools, after-school programs, or educational nonprofits in Australia. This might include assisting in settings, developing curriculum materials, or offering psychological support under supervision.

2. Mentoring and Leadership: Take on roles that demonstrate leadership and mentoring, such as coordinating or leading educational programs, developing workshops, or training peers. The experience you've gained from previous leadership in voluntary trips would be impressively expanded upon here.

3. Community Service Related to Psychology: Engage in community service activities that involve psychological support or wellbeing. This could be volunteering at mental health clinics, helplines, youth centers, or organizations supporting people with learning difficulties.

4. Research Assistant: Look for opportunities at your current university to assist in psychology research. This demonstrates your commitment to the academically rigorous aspect of your chosen field.

5. ** Societies and Psychology Clubs**: Being actively involved in, or even taking leadership roles within, relevant societies or clubs at your university will show with the field beyond your coursework.

6. Podcast or Blog: Launching a podcast or blog on psychology topics, particularly educational psychology, can act as a strong to highlight your knowledge, communication skills, and enthusiasm for the subject. Aim to produce content that ties into educational psychology, such as discussing developmental stages, learning processes, or psychological well-being in educational settings.

7. **ELICOS Tutor Taking up the ELICOS positions you mentioned would not only give you valuable teaching experience but also demonstrate your capacity to work international and diverse student groups, an increasingly important skill in educational psychology.

When documenting these activities for your scholarship and graduate application, consider the following:

• Provide specific examples of your contributions and leadership experiences in your volunteer.
• Offer tangible outcomes or impacts of your volunteer work, such as the success of an event you organized or improvements in students' performances you tutored.
• Reflect on what you learned from each experience, tying it back to how it prepared you for advanced study in educational psychology.
• Where possible, quantify your involvement (e.g., "Organized a series of 5 workshops attended by over 100 participants").
• Keep in touch with individuals who can act as referees or provide testimonials of your work, preferably someone related to the field of psychology or education.
• If applicable, outline any challenges you faced during your volunteer experiences and how you overcame them, showcasing problem-solving and resilience.
• Consider maintaining a portfolio of your work, especially for your podcast or blog, which could be submitted as part of your application or showcased during.

Remember, each activity you engage in should serve a dual purpose; it should contribute meaningful value to the community or institution involved also further your personal and professional development within the field of educational psychology.