How to get rid of flies

https://homesteading.com/get-rid-flies-outdoors/

Give them somewhere else to go: the fly bar. Use a covered plastic tub and poke a hole in the lid large enough for a fly to get in. In the tub add enough apple cider vinegar to come up the side of the tub 1/8 inch. Add a pinch of sugar and a dash of flowery smelling dish soap. In they go - in they stay.

If you can get around the voice in this video, maybe it can help with the problem...

When we were into camping more, I would spray the screens with Avon's Skin So Soft to keep the bugs away, I even did it on screens a few times in the house and it worked. You just need to reapply when necessary.

make up a solution of one part vegetable oil to two part washing up liquid stir together get empty plastic bottle cut in half put solution inside then invert top of bottle into the base of it it’s like rotting meat to them but doesn’t smell bad to us once they go in it they die

Here is a post I wrote that might help you https://chascrazycreations.com/irish-spring-soap-and-flies/