This is a tough one, and in the end, it is honestly going to come down to how you feel, what you want in life, and what kind of challenges you are/aren't willing to face. It is very rare to find a job that you enjoy. Especially a teaching job with autonomy, great coworkers, good pay, and a supportive environment. If you opt to step away from this, just know that it is a big risk, and the probability of finding a new job with all of those perks and privileges is fairly low. Of course, that doesn't mean it's impossible to find a better job, but the pros you have at your current job are often few and far between. I think it's important to prioritize your own feelings here rather than comments from the peanut gallery. Do you enjoy your job? Are you happy there/content with your position? Do you personally feel that you need to switch to something new? If you don't feel that change is necessary, I think you should consider staying there. You are doing valuable work in a low-income school. Unless you're dying to move up the ladder, it would be a waste to leave for something that could end up being worse. Either way, I agree with divine1966 that you shouldn't say anything until you are sure you have a new job secured and lined up. Good luck and wishing you the best!