I have and still having those "episodes" like you do. It is normal when you are writing especially when you think your writing is not good enough compared to other writers. But just write it, submit, and see what happens.

You have to decide and focus on something you want to write about. Stick to it for a while. Write 10 to 15 posts about it consistently like once a day for the next two weeks. You will be amazed what you'll discover.