You can definitely learn a lot of solid info on your own through books and free info online, but I've found my career went a lot faster when I was in a community of people who were in the same place as me.
Case in point: just last week, I had a chat with Emma Siemasko who runs the Freelance Writing Coach podcast with Kaleigh Moore. Emma and I were in a mastermind hosted by The Copywriter Club a few years ago, and we work in the same space. So when I needed to gut-check the rates I was charging B2B clients for copy, I'd already built a relationship a person who's got a solid following in our space.
Turns out that someone at my level should be charging at least $1/word for B2B content and $1200/page+ for web copy. And I'd been undercharging.
Yeah, I'd read the reports and articles about how much copywriters should charge. But having a community of people who know me has been really helpful to get this kind of feedback that's personal to my skills/abilities/experience.
(Her and Kaleigh's podcast is awesome, by the way. Worth checking out a few episodes.)
You can look at my reply history for other stories about how investing in the right learning opportunities helped me quadruple my rates, get multiple six-figure in-house copywriter jobs, etc.
All that to say, I've spent quite a bit of time in different online writing courses, masterminds, etc. and know which ones yield the best results. Here's what you'll want to look for.
Always, Always, Always Look for Community Anyone can post recordings of videos online and PDF worksheets. But the real growth comes from being able to interact with other people who are learning with you.
Alright, so you can tell I'm pretty sold on learning in a community. (It's why I'm paying $300/month to be part of yet another copywriter community for people making six figures in copy who want to level up higher.)
It's just going to be the fastest way to replace and exceed your current income.
If I were to start over again, here's what I'd do:
There are so, so many programs and books and courses to choose from. The biggest thing is to implement what you learn. It's so, so easy to get a 10x return on your investment with almost any training (except anyone who makes you call them "sifu," those people are definitely scammers). Start with the links above, and feel free to PM with any followup questions.
Good luck!