We don’t get rid of bad habits, we replace them with good habits. So, self-correct: when you notice you have said something incorrect, stop immediately, correct it and then move on.
Work a little bit every day rather than a lot three times a week.
Using Videos
Choose a song or a movie scene you like
Work with short sections (10-30 seconds).
Play without captions until you understand
Play with captions to check your comprehension
Look up all words you don’t know
Play short sections again, repeating after the video (shadowing)
From this process, you can use videos to improve your Listening, Vocabulary, Pronunciation, and Fluency.
Don’t try to do everything at once: target the development of your skills. Every day, choose something to focus on (e.g. five new expressions, a grammar point, or a pronunciation point).
Remember, we never make mistakes; we only make discoveries. Every error is a learning opportunity.