If you get stuck, who are you going to call? One good option is to ask your characters for help.
What I suggest is interviewing your characters. Each of them wants something (even if sometimes it’s just to be left alone). They want something in general, and they want something in the scene you are writing.
Let’s take an example: You’re writing a scene for a romantic comedy in which Brad and Jane meet on a blind date. You’ve written some good dialogue for their first awkward moments and you know that you don’t want them to get along too well at this first meeting, but you’re not sure exactly what to have happen in the body of the scene.
In this case some good questions to ask both of your characters would be:
- what’s the best thing that could happen on this date?
- what’s the worst thing that could happen?
- what do you think the other person wants?
- What do you find attractive and unattractive about them?
Those questions alone might well be enough to get you going. If he says the worst thing would be if she turns out to be clingy, but you don’t want her to actually be clingy (after all, we want them to get together at the end), what could happen in the scene that would give him that (wrong) impression? Maybe she's afraid of spiders and there's one crawling along the wall; she's embarrassed by this phobia but whenever the bug crawls near to her she can't help grabbing Brad's arm and moving closer to him--to be farther away from the spider, which he can't see.
Or maybe she says the worst thing would be to have him be one of those driven types who check their phones for new messages every thirty seconds. If we want Brad to do this even though that's not his usual habit, we need to plant a reason for him to check his phone on this occassion, and make it something too embarrassing or personal for him to be willing to reveal to her since they just met.
This interview method works for bigger plot points, too. Ask your characters what they want, what they fear, what their secrets are and you’ll soon have enough raw material to get you back on track.
PS: If you don't know their desires, fears, and secrets, spend some time fleshing out the characters, then return to the problem.
(If you want friendly guidance from the greatest writers of all time, get my book, "Your Creative Writing Masterclass." It contains writing advice from Dickens, Twain, Austen, as well as modern masters like Kurt Vonnegut and Stephen King, along with my tips on how to apply it to your own writing. You can get the book from Amazon or your other favorite bookseller.)