Assuming that you are already at 25 frames per second, reducing it to 24 is useless unless you are going out to film. Second, lighting and camera moves are a large part of it, as is creating a greater depth of field. Third, try moving the camera farther away and zoom in. That puts the background out of focus.
Fifth? Try some of the Magic Bullet effects if you feel the need to add film grain and emulate the people who shoot with film.
Just remember this one thing, if nothing else.
To make it look like film, shoot with film.
Steven
https://www.stevengotz.com