I'd been in the Python community for around 10 years, spoke at several conferences, wrote libraries; contributed to CPython, Openstack, and others. I've been a technical reviewer for a book on distributed computing in Python. A big part of my career was built on this language, its community, and ecosystem. I'd say a big part of Python's slow-and-steady success is its community. Going to Pycon US, Pycon CA, and Pycon's around the world -- the user groups that the foundation funds with Pizza money and mentorship programs: it's a fairly unique experience.
Another major factor is how it serves as a glue language in the scientific community. Python provides a relatively simple programming language that powers complex, powerful libraries like NumPy, SciPy, PyTorch, SymPy, etc. It's like a scripting language for engineering and scientific computing tools, sort of like what Javascript does for browsers, Node, and Deno, etc.
I don't do much Python programming these days but I owe it a huge debt! May it continue to flourish and grow.