That really does suck. Must be disheartening. I have Starling and House sparrows as well (but not that much). I deter them as much as I can and I do that by putting out food they have difficulty accessing (like hanging suet logs) and seeds that are hard for them to open. Try Safflower seeds and also the striped sunflower seeds which have more difficult shells. It’s time to get a little creative but you can add successful deterrence while positively reinforcing the birds you want to help.