One good thing you can do for your career is to not use the term manual testing (here is why).
Bret Pettichord has a presentation on the Four Schools of Testing, which may expose you to some new points of view on testing.
As of courses, I would suggest the Black Box Software Testing courses, such as Foundations, Bug Advocacy, Test Design, and Exploratory Testing. If you want to sign up for an online full course, the BBST courses are run now by the Association for Software Testing.
The Rapid Software Testing would also challenge you.
You are interested in coding, I would suggest reading Bob Martin’s Clean Code - but if you prefer video, he has this content on the Fundamentals and SOLID Principles at Clean Coders
Getting a job would also help you a lot. Try to hack out the application process. Create a script to reach people that work on the companies you are applying, something like “Hi XYZ, I’m a new tester and I am thrilled to start my journey on COMPANY_NAME, because of REASON_FOR_THE_COMPANY_TO_BE_AWESOME. I believe I can give a great contribution because I have worked on this, this, and that, and I have done the courses X, Y, Z. I know you folks get hundreds of great resumes, but I believe I can really hit the ground running and support the teams at COMPANY_NAME”
Hit on LinkedIn 2-3 testers in each company you are applying. If you get an interview for 5% of your messages, and you do it for 100 companies, that’s 10-15 interviews. And even if you fail at all, you will get good interviewing experience (which is 50% of the secret to get hired).