If you find the profession that gives you that feeling, and you are disciplined in your management of the business side of it by controlling costs, you have a huge advantage over your competition because you may continue to work 10, 15, 18 hours a day or 2, 4, or 10 years longer, not because you need to, but because you love the process and product itself.
True, the world is a bit unpredictable. That said, if you’re invested in a very broad index (like VTI, VTSMX/VTSAX), you are as protected as possible. If those indexes collapse/devalue, there are far greater issues going on than money. You would be fighting to eat and survive at that point, and money would be worthless. So, other than the world ending as we know it, you can be FI and have 99.9% assurance you are financially safe.
If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
I think it is hard for the majority of those who are seeking/building towards financial independence, to essentially turn the switch off. What I mean by this is that it is hard for them to ever feel “financially secure” because their whole life’s financial habits have been based on constantly earning/saving/growing their money. Based off of those deep ingrained habits, it is extremely difficult for that individual to suddenly change course and tell themselves they no longer need to keep growing their money.