hi Charlotte (@chargasc),
From Leading Test teams when you are not a manager by @nicolalindgren 
:
During my test career, I’ve found myself acting like a leader even if I didn’t realize it at the time. These patterns of behavior included:
- Mentoring and coaching others
- Being a sounding board for other testers when they needed someone to listen to them
- Introducing other testers to new ideas (like exploratory testing)
- Doing presentations for other teams on how testing is done
- Running workshops on various aspects of testing
can tell you if you are already doing this. Additional tricks - also when you are aiming for a leadership role is the leadership wiki:
Getting to a leadership role in testing has the same challenges as any role really. I often revert back to the StaffEng site - most of the descriptions are also relevant for test leadership:
Latsly, let me mention I’m currently writing a book about Leading Testing Activities? all of the resources above are already in the book so far. 
All the best on your journey, Jesper