أحسن الله إليك Can I work at this halal fast food place where they give discount coupons for holidays like Fourth of July, Father’s Day, Christmas, etc if my job is making the orders and giving them out, and nothing involving the transaction itself?

If your work is only making and handing out ordinary food, and you are not the one promoting the holiday offers, there is no harm in it in shā' Allah. If your job involves advertising or giving out the holiday coupons, avoid that part, because the scholars said a Muslim may not help them in their festivals with anything.