A few tips:
First, looking at the main page of your website, the story isn't clear to me. It leaves too many questions. For instance, who are Rohingya refugees? How many of them are there? Are they all in Malaysia? (No, including a link to Wikipedia doesn't cut it.) Who is UNHCR? Who are the kids in this school and what is their age range? What is their grade level? How big is this school? What does it look like? What's the "RREF" mentioned on the first page? Who is responsible for hiring professional teachers - you? What are their qualifications? How much are they paid? How many teachers will be hired with the $28K you hope to raise? Who are you and what are your qualifications? Point is, you've got to step out of your own head and think about whether people visiting your site will get what you are saying.
Second, why should I or anyone else care about this particular cause? What does it matter if the school is underfunded? What is the impact? Most people won't take the time to extrapolate, such as: school is underfunded -> kids won't receive an education -> kids without an education lack economic prospects -> lack of economic opportunity is linked with long-term poverty, unemployment poor health, etc. -> not supporting the cause now means that the future is in the toilet for an entire community of children. I know it's very clear to you because of your involvement, but you've got to spell it out so everyone can understand.
Third, you've also got to target your appeal to people who care -- in most cases, the individuals who give you money will have some sort of interest or stake in the refugee community or the school. Perhaps they originally came from Myanmar or they were refugees themselves who found their way out of poverty via education. Another likely prospect is people who personally know you (e.g., parents, siblings, best friend, neighbors, business colleagues, etc.) or others people involved in the school, like teachers.
Fourth, anytime you make a group ask on a forum liked LinkedIn or Facebook, you will receive a lower response than if you approached people in a more personal format, such as sending them an email or a letter with an ask. (I wonder if there have been studies on this. It probably has something to do with diffusion of responsibility...) You also might want to read up on other forms of fundraising like house parties.
Fifth, while I appreciate your commitment to financial transparency, why are you trying to raise money for an endowment fund? I understand that endowments can contribute toward fiscal stability, but you're putting the cart before the horse. You need operating reserves before you create an endowment fund. It's the same principle as personal finance - you've gotta create an emergency fund before you start socking away money for retirement.
Lastly, you need to have a team to help you fundraise! If you've got IRS 501(c)(3) status, you must have a Board of Directors. How are they helping? Are there any other allies you can recruit to assist with fundraising?
Hope this is helpful.
