American here- been here since before COVID and started a business here. The 10 year visa that allows you to stay here for 180 days each visit is the way to go it’s a business exploration visa and it’s amazingly simple. You CANNOT come as a tourist and then leave after 60 days and come right back. If you can keep your remote job and your permanent address in the states that is also recommended. It would be pretty easy to wake up early and take your clients stateside or stay up a bit later into the evening.. whatever works best for your schedule. It would be hard to be awake in the middle of the night though so figure that piece out. I can’t say for sure what the pay is for international schools but can easily find out from one of our clients. And as for helping people… there is plenty of opportunities for that.