wasys you can promote a film

here are a few ways that you can advertise a movie

poster - put posters in cinemas or in areas where they are located to attract audiences 
advert - put adverts after tv shows to mainly attract viewers
trailers - advertise trailers on social media sites to attract views 
merch - sell merchandise to attract more viewers
game collab - collaborate with a already popular video game to help draw viewers to your movie
lego - do a collaboration with lego or a existing game/toy to help grow your movie