[Chyzwar]

Some big companies have structured programs for mentorship. In most cases these programs are targeting graduates.

Maybe by contributing in Open Source. If you find a project you are interested and start doing contribution there is a chance that maintainers would mentor you.

Senior Developer time is highly constrained, we have families, demanding jobs, side projects and still need time to learn new stuff. Mentoring random people on the internet do not look attractive.

The sad truth about programming is that you need to spend a lot of time in front of a computer, usually struggling and alone.