Ask HN: Is it too late to make a side income by creating Udemy courses/similar?

I'm almost 30, and since I was 15 I've on/off wrote blog posts and written tutorials (some on my personal site, some paid articles + paid series a long time ago). One of the few things I enjoy doing at work (DevOps engineer) is teaching/training other people. I run a few small online side projects for beer money, but I'm not that interested in most of them, whereas making money from creating courses would be a dream for me. For the last few years I've been using Python to build internal REST APIs and so on, and I'm also fairly well versed in PHP/Laravel. I'm not actually a SW Developer by trade, but feel I know more than enough to write/record courses for something like Udemy. My issue is searching Udemy for any phrase such as 'Python rest', 'Python flask', 'Python web scraping' yields thousands upon thousands of results. Is it too late to start creating content for subjects like these? I'm not really