Definite cure for spider mites (EU)??

I keep battling spider mites and I have tried nearly everything but they keep spreading and I’m scared to loose my whole collection 😭 I’ve tried all of the following: insecticide (they seem to be immune already, it’s called Careo Rose spray - see pics in comment), canola oil mixture, neem oil, predatory mites, lacewing larvae (currently in use). NOTHING seems to help and I need sth definitive to get rid of them. I’m very much open to use sth strong as I’m actually starting to loose my mind and my plants keep looking worse…

Important: it needs to be available in the EU (!), specifically Austria. I unfortunately cannot get my hands on American products as they are banned here. Any help appreciated 🥲