Hello, speaking and writing are different skills from reading, you need to learn and practice what you've learnt. I'd suggest searching up these skills for self study, and/or learning with a teacher. I can help you with this issue. Please check out my teacher profile and feel free to book a lesson :)

7:3 output:input is the optimal ratio for learning to speak quickly. This means that if you are having trouble talking, you should be talking at least twice as much as you read and listen. Hope this helps :)

I think you should try active learning. Because when you write or speak to yourself, those are passive learning. Having someone as discussion partner will help you to improve. For example, I have themed discussion with my intermediate students. I’ll share the topic before the class, so they can prepare a little bit. The more you talk, the easier your brain to automatically respond with various vocabularies.

Hi Coral, I'm a native English speaker and community Tutor. I offer conversational English lesson which will help you practice how to speak English and the correct grammar. Please check out my profile and book a trail lesson. I'm currently available for instant lessons

As said by someone else, language learning is like a muscle. The potential will always be there but unless you train and use it, you will not be able to make the most of it. Talking to ourselves is very different to talking out loud to another person since proper communication requires organising thoughts into coherent words and being able to deal with spontaneous questions and viewpoints. Writing is easier to practice but to check it for naturalness, its always better to have a native with you :)