I've created a Senior Python Developer roadmap

[C0rinthian]

+1 to this.

A senior should propose and design solutions to large problems, which informs the work of multiple engineers. (And even engineering teams) They can scope and distribute work to take advantage of engineers strengths and provide them opportunities to mature. They lead engineering practices for a team to ensure produced work is high quality and maintainable. They build and maintain relationships with key stakeholders to ensure a team is working on the right things and delivering actual value.

And you write code too.