What everyone else said.
… Chapters aren’t strictly necessary to tell a story, but they do serve to chunk the story.
They also tell the reader about the structure—generally I think each chapter promises to have at least one significant development, and often something smaller that is resolved or complicated.
It’s also convention, and conventions aren’t bad; often, conventions let a reader look past the familiarity and onto the more salient, different, nuanced aspects of the piece.
On the other hand, sometimes a convention gets in the way of what you’re trying to accomplish, or makes it unnecessarily difficult. Then it might be best to ditch it (or modify it).
I had a professor who always said something to the effect: “it’s always okay to break the rule, as long as you have a good reason why you’re breaking the rule.”
If you want a more experimental form, go ahead and play with it. Or if chapters just seem to be interrupting the flow of the story more than enhancing certain moments/aspects/developments, maybe your story is one that shouldn’t have chapters… it could also be that since you’re in a revising mode with a complete draft, the places chapters belong have shifted from what the initial outline/plan had indicated. Or, it sounds like you might have titled chapters—if you’re not liking the titles, you could also experiment with just using numbers.
If you omit chapters (which is doable if it serves the story), I would suggest still having some sort of break. Many books that don’t have chapters still have natural transitions in the story, shifts in time or POV, or miniature conflicts resolved. They’ll usually put an extra carriage return between those moments for some sort of break or change of pace for the reader. Chapters serve the readers, so I would suggest just make sure you have a good reason to omit them, and then replace them with some other form of story chunking.
Btw congrats on the novel-in-progress!