The main tips are, release only a very few movies in the first 10 years, and that way you'll have a big bank of movies to release to make 1 actor a prolific star.
Other things include giving people a bigger entourage just before the awards, making sure their trailers are totally rennovated, making sure there are lots of ornaments in their trailer area, give them a pay raise, and release a movie of theirs a month or 2 before the awards ceremony to make them happy and win best employer.
And yes, having 4 actors, 2 directors is usually best, directors can star in movies as well if you get really stuck