Wow! You’ve done a lot of research. I didn’t realize freelancers were originally warriors … and in some ways we still are — it’s not the easiest life but it’s also a rewarding one.
I would also look at Constant Content (www.constant-content.com). It’s free to sign up and you can sign up if you live outside the US. You just need a PayPal account.
Once you’ve signed up, you can submit articles and blog posts on any topic, which you put up for sale at your chosen prices — it’s like an eBay for articles! When someone buys one of your articles, you get the price, minus the website’s commission, paid to you by PayPal.
I found it a great way to start freelancing, because I didn’t really like bidding on work as you do on sites like Upwork. Wishing you every success! Please let me know if you need any help or have questions!