I've been writing for a while, first there were short stories, then poems, then songs, then short stories again.
It has been cyclical, because it has been linked to my own living. First big me"batch" was when i was 15, it lasted 2 years, i won some awards at the time, my vocabulary was just the richest it has ever been, my ideas were linguisticly luscious for once.
Change of life and scenario, lots of new things to discover, 10 years later started again, this time there were songs, and stories, in new languages, not as rich as the first batch. It lasted almost 10 years. It produced around 50 good texts that i have yet to arrange and record.
New changes, new scenario, lots of ideas in my mind, but i don't have any more the imperative urge to write.
As others have suggested, writing is an exercise, and you need to exercise systematically. Then, as my French teacher used to say: "a writing is like a wine, you need to let it rest in the drawer, and take it out from time to time to turn it"
I also like the contextual method: write something and that's it, no rework, leave it as is...
But start by writing, brainstorming ideas, once is all working good, then, start Writing it'll come.
Never throw out anything, an old phrase can be your new inspiration...