When starting out in any profession you will have some sort of weakness. The best thing to do is to know what you weaknesses are. When you know what your weaknesses are you can improve upon them.
For example you could be learning how to skateboard and there’s a trick that you are learning. While learning the trick you tend to notice if you put your foot in a certain place and jump so high you will be able land it.
If you are designing a poster and you’ve filled up every single bit of space and used multiple fonts the weakness is thinking you need to fill up every single bit of space. Also you have a problem with simplifying things or that could be something else.
Always remember that knowing your weaknesses can help you to improve but only if you want to improve.
Design and calligraphy 