I started a thread about this sort of a while ago, asking how we actually train staff.
I think good training will lead to good retention. Locally we’ve managed to recruit a number of parents who are currently going through the join process. I’ve asked that we organise a sector training session day or weekend for new staff. My thinking was properly covering the PTS and other stuff we do in detail so new staff can see what interests them, then we can sign post them to become specialised in what ever area they want to do!