1, writing for a long time is easy to cause hand muscle fatigue.
2. It's not that the more you write, the uglier you get, but that your aesthetic level has improved, but your writing level has improved less, and your aesthetic level can't keep up, so you will feel "ugly". This is a sign that you are superior to others, so you don't have to worry, because it is a symbol of your progress. Everyone who studies calligraphy will have such problems again and again, and then they will improve. You can copy more copybooks, improve your writing level and make it equal to your aesthetic level, so that you won't feel "ugly".