How can I correct my handwriting without bones and muscles?

Your handwriting has no bones and muscles, because you don't have to stroke in the middle. You should reduce your side strokes, so that your words will have a strong feeling. When writing, the strokes should be as vertical as possible or slightly inclined to the paper, and the words written in the center will not appear soft. You should pay attention to the beginning and end, be close to the copybook, and practice words in the right way to make progress.