Mentors can be a legitimately good way to progress your career; but 100% of the online mentoring services are bullshit.

Like, for anyone salaried in a corporate environment; pick someone ~3 rings higher than you on the ladder in a seperate department (e.g. Team Lead, Department Head, VP, GM etc.).

They will be familiar enough with the business to provide useful guidance, helping you build up not only your skillset but your professional network. Because, the dirty secret is - after a certain point, it’s not necessarily what you know - it who you know.