Starting out as an entrepreneur, my biggest fear was whether or not I could find a job if my company failed.
My family instigated this fear: "The first years of your career are the most important. Find a job first, create a company later."
The college I graduated from held the same belief. Those who work for a Big Four or a FAANG are part of the "elite", and these companies are known to welcome with open arms young suggestible students - not 30-something failed entrepreneurs.
Most startups aren't different either: if you don't fit in the "company culture" (meaning, the founders' dogmas), you can't pass through the gates.
That was a lot of variables for a 23-year-old born in the working class who spent 80% of his time on earth in rural France.
Reading books and blogs saved me though. I'd been saving money since my 18th birthday. My first job as a software intern allowed me to stock up some more, and by the time I reached 23, I had enough to survive at least 3 years without having to earn a dime.
The fear of unemployment was still there, but that was a problem I could solve later. Running the company was more urgent.
I'm now 25. I still have yet to earn enough to cover my livings expenses, but the traction is there. I earned nothing in 2018, then $2000 in 2019. January 2020 will be my most profitable month since I started, by far. I learned a great deal about what it takes to earn money by myself. It comes down to 3 things: skills, relevance, and proof.
First, you need marketable skills people are willing to pay for. Being able to eat a lot is a great skill, but it's hard to sell. Programming, writing, or cooking is a skill some people need.
Second, you have to stay relevant. The way you present your skills to an employer/customer and how up-to-date they are will give you an edge over other members of the talent pool you're in.
Last but not least, you need proof of your expertise: people, content, and projects - in that order. Opportunities come from people, not companies. If you know the right people, it's obvious your employability rate increases. Content (blog posts, tutorials, videos, podcasts...) and projects backed by numbers, on the other hand, will do the talking for you. You can use them as leverage to prove your ability to add value to any business.
As Cal Newport would say, you have to be "so good they can't ignore you". That's the only rule. Those who create great wealth are bound to attract customers, and by proxy, employers. Since this is the entrepreneur's top priority, there is no fear to have regarding employability.
Sure, you might close some doors. You'll scare some people. They might hate you. However, I assure you you'll gain something much better in the process: self-knowledge, a form of freedom, an incredible feeling of control over destiny from time to time, and more importantly--if you remain true to yourself--you'll find your people. It's not easy, but it's worth it.