A college degree is good, but skills and experience are also very important. If you work for one company for a long time, you may be doing specialized things that do not translate to the broader job market. It is necessary to keep your skills sharp by participating in training and asking for different assignments at work, and moving on to another job if there are no such opportunities available for you. Otherwise you end up a has-been. It's hard to come back from that in your 50s or later. This is something that requires a lot of ambition: staying sharp is not easy or comfortable. You'll have to get outside of your comfort zone repeatedly, and possibly move to a different city or state.
A lot of people think a job is security--it is no security, no matter who you are. It is too many eggs in one basket. No matter who or what you are, you are not indispensable, and your employer does not give a rat's ass about you. They may do a few things to try to keep you and your colleagues happy, but ultimately that is just part of the economics calculations to your employer.
The gig economy offers some security for people who are reliable and customer-oriented. As an example, I caught a Lyft ride to the airport the other day at 4 AM with a guy who said he makes $600 a day (working 10 hours). He focuses on one market: nighttime. He said he is very busy by 2 or 3 AM with airport rides. I calculated a bit to see what would happen if he drove people like me to the airport and back all night (25 minute ride for $45, I think Lyft gives him 85%, assume he makes tip of $5). Even if he cannot get two fares an hour, he could still easily clear $600. If he works 6 days per week, he can make $187K before tax. Now he would have some expenses, but at this wage, he can buy a new or slightly used Camry every year and still make a decent living--one that requires no education or experience. Why isn't everyone doing this? It requires a work ethic, living in a major city, working unusual hours, and putting in more than 40 hours a week.
My point is that there are many ways to make a living and build some security: white collar or blue collar. In either scenario, achieving security takes effort. Ambition seems to be in short supply these days.