Great topic - how to grow into leading testing activities is on my mind too these days*. Let me find some resources for you, as it has come up before. Many are on this journey 
- How can I grow into Technical QE manager from Lead SDET?
- Books on leadership
- What “glue work” did you do that led you to a leadership path?,
- “LEADING QUALITY: How Great Leaders Deliver High-Quality Software & Accelerate Growth” by Ronald Cummings-John & Owais Peer, 2019, https://www.leadingqualitybook.com/
- "Engineering Management for the Rest of Us”, Sarah Drasner 2022, https://www.engmanagement.dev/
- Daniel Knott 2023, A Pathway From Software Tester to Manager, A Pathway From Software Tester to Manager | PractiTest
- “Test Management & Leadership Wiki”, - one the club https://club.ministryoftesting.com/t/test-management-leadership-wiki/
Hope this is helpful - all the best on your journey. Let us know how it goes
/Jesper
*: After 20 years in leading testing my angle is how we grow new leaders of testing activities. That is the topic of my upcoming book 