I'm not a literacy lead but very interested in literacy ( I teach science). Thinking about what we do in our school;
New group reading test and another test (name has escaped me at the moment) to identify weak readers and their issues. Fresh start phonics and/or Lexia intervention as appropriate.
Information is shared with teachers about how to support these children in lessons. As a school, if we are using a piece of text with children, we read it aloud and they follow. This models fluency and supports the weakest readers to access the text.
We explicitly teach carefully chosen subject specific words (chosen by each HoD). Writing is carefully modelled as appropriate and we use turn and talk alongside making sure children speak in full sentences, don't use slang in the classroom etc.
Form time twice a week we read a class book. Very carefully chosen to engage pupils and address key issues relevant to our context. Adult reads aloud and pupils read along with a reading ruler. We have a booklet, created by literacy lead, which supports the team so we can discuss the text with pupils, highlight key words etc.
Our library is very well used and the librarian is wonderful.
The key is that things in isolation are unlikely to be the most effective. Everything needs to join up and literacy needs to be a thread through the curriculum, including taking account of the disciplinary literacy.
I would suggest you try to find a local school who has strong literacy provision and go and visit to see what they do.