I agree on the ownership and proactivity being key here. Look for possibilities to show and practice leadership skills within the current company setup and role

I agree on the ownership and proactivity being key here. Look for possibilities to show and practice leadership skills within the current company setup and role. This can be as simple as taking one story end-to-end to production from requirement analysis to deployment and experiment analysis while interacting with different roles (product, engineering, devops) and even explicitly asking your manager(s) for such possibilities. Being the person that knows the progress and owning success is key here, plus you will score some points for being someone that work can be delegated to. Organising learning groups, guilds is also of help to get visibility within an organisation while still being fairly close to tech as you form a group of people around a topic you're passionate about. Another important aspect is cross-team collaboration. For example, bringing key people together to solve a problem for the organisation (i.e. spending too much time on deployments, production incidents, repeating the same problems). Calling such situations out and suggesting ways to solve it or collaborating on a solution is another great way to try out leadership skills.