Let's face it, no one is going to promote you better than you. Start with friends and family - everybody knows somebody. Visit your local library or local book store or both and schedule a book signing. Contact your local literary society or book club and see what they can do for you. I see you are also accepting novellas and collections of poetry.
Screenplays only compete with other screenplays.
Novellas only with other novellas. Collections of poetry only with other collections of poetry. There will be no mixing or matching. No fruit baskets. Give me a break.