Remember if there is any moral ambiguity or if its not clear enough, make sure to constantly remind your readers to point out that a bad thing is bad and they shouldn't do it.
If you're writing a sequel to something that was made long ago, make sure to turn the previous lead into a jaded loser who is absolutely pathetic, undo their previous achievements, and rehash the same thing. The readers would love to see you retread their heroes journey or be the washed up mentor for the plucky new character everyone will love.
If you want to make everyone love a character you really love, make sure to have everyone say how cool they are, and if they're not in the scene, spend your time praising them or have them think about them.
To make a great romance, make sure the male lead gets the girl by showing basic human kindness in a normal society. Holding the door open will lead to marriage you know