There could be some activities which could help, in my opinion:
- awareness ( and training, where needed) of QA proces inside the Development team, especially those aspects which directly impact them: unit testing, defect tracking
- reinforncement of existing SDLC proceses and used tools among all project team.
- reinforncement of existing best practices ( for requirements definition, design, coding, testing,...)
- participation of all project team at leasson learned after each project
- training in risk management for all team