My favorite block-buster is writing more.
The more I write, the more I think about writing, and the more I think, the more ideas appear, seemingly from nowhere.
The more I write, the more chances there are that I will write something good, or maybe something that will resonates with me and energizing my writing further. Once this happens, well, you know the rest: that’s when nobody can stop you from writing.
So how do you "write more", if you are complaining about being blocked or stuck?
The answer is to write anyway, write poorly, write whatever you can, even if you think it is no good.
You can’t win the lottery if you don’t buy a ticket.
Write anyway. Do not sit there. Do not think about being blocked. Instead, pretend you are not blocked.
Ask yourself, what would I do if I weren’t blocked?
Here’s a couple of reference sites to help you unblock: