It's a pacing thing for me. Each chapter has at least one major plot point to urge the reader on to the next chapter. Each chapter has 1-3 scenes, depending how much you want to cram in.
My chapters run from 15 to (and in one case) 40 standard manuscript pages, usually averaging 20-25. Twelve to fifteen chapters = a solid length novel.
I dislike writers who do little 2-3 page mini-chapters. Those give the reader an excuse to put the book down at any time, and they might never pick it up again. They also do not give the writer much room to develop a good scene or expand on character development.
You want scenes in the chapter to have a beginning, middle, and climax. Two to three scenes per chapter is something to consider or a chapter comprised of one scene is fine. After a bit of practice you figure out what works best for you.
Just don't be the kind of hack who works on a scene until it bores you, then throw in a break to start a shiny new scene. I've spotted those again and again, even in commercially published works. You be a better writer than that. Keep in mind that if a scene bores you, it will certainly bore the reader!
It's okay to be a pantser, but your book needs structure and pacing. Breaks should serve a purpose, not be because the writer ran out of steam or ideas.
Each chapter needs to end in a climax. It need not be a huge, but it needs to urge the reader to turn the page.
You, the writer are NOT to be polite to your readers. You be ruthless. You build in those cliffhangers, large or small, that keep the poor readers up all night, unable to put the book down, and then cursing your name as they sleepwalk though the next day like stoned zombies.
Because along with cursing you, they will demand the next book
immediately, if not sooner. They will track down like minded friends and insist they read your book so they can talk about it, and they will become lifelong fans.
You ever get caught up in a soap opera? At the end of each episode is some kind of climax so you HAVE to tune in tomorrow to see what happens next. That's what you do as a writer.
One of my hacks is to get a stack of index cards and write out a brief synopsis for each specific scene you want in the book. A single sentence is usually enough: "Harry meets the killer" and "fight scene" and "Harry rescues the cat", etc.
Spread them on the floor, tape to a wall, or stick them up on the fridge with magnets. Arrange in the order that best works for telling the story. Keep the best, toss others if they don't work.
This kind of hack is great for pantsers who are free to insert new scenes as they occur and outliners who like to keep track of the story arc and organized.
Pick favorite books that you've read many times and look at the chapter endings. Is there a little climax involved? How are individual chapters constructed? What key scenes take place that lead to that cliffhanger? Study how other writers have tackled this.