One thing I think is useful when planning a construction career is to focus on the responsibilities you want rather than simply chasing a particular job title. If site management is your goal, areas such as team leadership, planning, coordination, communication, supervision, and project organization could all be worth developing. Identifying those areas can help you decide whether additional education is appropriate for your career stage. A level 6 management course is one option I found while researching qualifications connected with construction site management. The College of Contract Management provides an online programme focused on this field for professional learners. I'd suggest reviewing the course content and considering whether it complements the experience and knowledge you already have. If it supports your longer-term plans, consider enrolling and continuing your professional development.