From the information, I have gathered the main detail which is included in this document and not in the website is ,
What is SEF?
The Sustainable Education Foundation (SEF) is a volunteer-driven not for profit organization
SEF was founded with the short-term goal of making the Sri Lankan education system the most effective and most dynamic education system in the world with the help of a specialist global network of local and ex-pat Sri Lakans.
We can edit and add this part as the motive
SEF’s long-term goal is to disrupt and democratize the global education system where it is available for everyone, in doing so, the foundation contributes to the United Nations’ sustainable development goal of “Quality Education”.
The history and how it was found by whom etc
founded by:-
former Google Student Ambassador and alumnus of the University of Moratuwa, Akshika Wijesundara.
The most important piece of information I found was this picture given below
Basically, it summarizes the overall goals, motive idea and gives a clear picture to the general public
So my suggestion is to filter out the vital details here, and add or subtract info (since this document is a bit outdated), and give quality output in a creative manner to the website and make it publicly visible.
Also, the part of the future plans is missing, in the document, it gives an idea (not exact since it is unpredictable), but at least a rough estimation about the overall goals can be displayed on the website, so the people who want to join SEF, WIll know how and what they can contribute to the SEF.
this SS from the documents gives a rough idea, but we can rather think of a creative way to bring it up (maybe a calendar, a road map) to depict the path we would follow. since the plain text will make people hesitant to read it.
Although the join us request is given, the exact outcome of what the volunteers would gain in the process is not shown. We can include these details and more to gain attraction.