Flooring Galway

House is 25 years old. Upstairs is insanely creaky in places. I've tried all the old reliables like working in talcum powder etc. Nothing doing.

I don't know if the entire thing needs to be ripped out and redone or if a few well placed screws into the joists would be enough.

I imagine I'm looking for a carpenter more than someone that does flooring, but all suggestions welcome.

Happy new year 🎉