And just hang in there. Everyone progresses at different rates and it can take a while to build momentum.
It was an old aphorism among prose writers that you have to write 'a million words' before you start getting to the point where you can call yourself a writer. (That's like 10 or 12 novels so, you know, you can take that with a grain of salt.
) But the bottom line is you've got to write, write, write and keep writing...
And when the writing doesn't come, try going back over old writing and editing, rearranging, salvaging stuff.