First, I don't think we should write better with a ruler. Some students have developed the habit of writing like this since primary school. Even if the ruler is removed, the words below will be flattened.
Secondly, it is best to write with a striped notebook. After a long time, you can get used to it and naturally become neat.
In fact, to write a word well, you have to write it one by one. Copywriting can be regarded as a tool, but don't rely entirely on it, or write more and write well by yourself. When writing, pay attention to the size of each word, horizontal and vertical, just pay attention at all times, don't hold the pen too hard, in short, practice makes perfect, write more and practice more.
I think writing brush strokes is of great help to writing and even writing brush strokes in the future. I have seen many students who write beautifully practice calligraphy.
Finally, I hope you can write beautifully and well.