Well, different writers have different approaches. I’m an outliner and generally put together very detailed road maps for my stories. So if I feel stuck, I check the map for missing pieces. Maybe I realize that I should have set something up earlier in order to make the current chapter flow better. In that case, I make a note to include that set up in my next draft of the story and move ahead as if the change has already been implemented. My goal is always set on reaching the end of the current draft, so I do my best to result in the urge to go back and do rewrites before I’m done.
If you are not the planning type or you don’t believe the issue is with your plan, just give yourself time to work on the program. Re-read what you already wrote, go on silent walks, take classes from inspiring people like Dijon Bowden; do whatever you can to get the creative juices flowing. Resist the urge to start another story in the meantime; that’s how you end up with a ton of unfinished stories in your track record.