You want to self study English effectively and your goal is improving your speaking skills to become a successful communicator. It’s awesome! You have found your learning needs and shaped your learning goals.
But, what’s your plan for the most difficult part? How do you plan to take your learning into your control by finding appropriate materials, methods, staying disciplined and motivated…? Everything would be up to you and it’s easy to lose the thread of how it all works!
You should also find a safe place or community to put your learning into intentional and meaningful practice, or your transformation would be too slow and frustrating. You can only improve your speaking skills by doing it and reflecting on your deficiencies, not just by studying it! Finding such an opportunity is not easy and takes trials and errors.