I'm thinking of quitting my job indefinitely
Why would you be thinking about quitting your job?
I've got an offer with an NGO that offers me a lot of privileges.
That's great news. I think you should accept the offer because it sounds like a step up from what you are doing. There is nothing wrong to seek better stuff for your life especially when the opportunity presents itself, you should grab it quick!
Yeah. I hope I can convince some of my coworkers to come along with me.
It sounds like it may be a great opportunity for all of you. I hope it works out well.