Wanting to improve your American English speaking? Do you practice 'shadowing'? Do you practice your speaking in front of a mirror? Do you watch other peoples mouths when they speak American English? Do you watch American English shows/movies? If you're not making much improvement it might be because you might not be doing these things...or doing these things so rarely. Or it could be that you've never had someone from the United States judge your spoken American English and give you typed corrections about what you actually say. So you can be informed about what you actually struggle with.