People have a lot of things that they could be doing. There are a lot of distractions out there in the world. Committing to reading a full book is a lot to ask of them.
So, if you want them to feel satisfied when they get to the end of your story, you better make something happen. You need to create an ending that is satisfying. Most of all, you need an ending that includes something happening.
Don't let luck or chance create your ending. Don't let your ending happen off screen. Don't let nothing happen and your protagonist just be satisfied with the situation they've been in all along.
Make something happen in your writing. It's the best way to make your readers look for your next story.