I don’t want to go through all but some of the more interesting ones:
Ethiopian - delicious stew/curry type food with this fermented flatbread stuff that almost smells a bit like beer. Way better than this makes it sound, lol
Vietnamese - if you like Chinese food you will love it. It’s somewhere between Thai and Chinese. They have an awesome beef noodle soup called pho
Jamaican - my family is partially from here so bias but jerk chicken is worth a mention alone. Very well spiced and usually super juicy chicken. Meat and rice type of stuff. But ackee and saltfish is interesting too, very salted cod mixed with this subtle flavoured fruit that looks a bit like eggs? Again better than it sounds.
Moroccan - If you’re interested in Egyptian food (I also have no idea what that would be, lol) Morrocan is probably a good recommendation. They have a dish called tajine which is a well spiced chicken stew, they cook it in a special pot I think
Mexican! - I know it’s obvious but in Europe Mexican restaurants are very basic. Tacos, burritos etc. But there are so many amazing dishes like mole (chocolate and chilli sauce, fucking delicious) that always get missed. There’s one called queso relleño (?) That is basically like a very rich Bolognese wrapped in cheese and FRIED. Probably best not to eat too often. But maybe you guys in the US get more authentic Mexican food anyway
Also, saying “ethnic foods” comes across a little odd. Makes you sound like a 50 year old white guy who’s never left his home town and isn’t so sure about all this weird food these strange brown people eat. Nothing wrong with being white or culturally insulated of course, but probably not the look you were going for. Might explain the downvotes.