https://www.coursera.org/learn/it-security
My husband was unemployed and learned MongoDB and Hadoop here. He’s employed now. I think many of these courses are free, but the carts cost money.
https://www.us-cert.gov/ics/Training-Available-Through-ICS-CERT
The government likes secure networks. You can sign up for their briefings.
https://www.us-cert.gov/about-us
You can add yourself to their mailing lists.
Don’t doubt yourself. If you care enough, you should be fine. Do go the Certificate pathway, though, you’ll be more marketable.