You gotta do this to keep your audience engaged, entertained and excited to read what you've cooked up for them

If your book is just filled with one particular style of writing, then it won't have as much range within your audience as you want it to

Add some fluff, add some angst, add some comedy, add some smut (if you're comfortable with it)

Fluff- All that lovey-dovey, cliche, heartwarming, gooey stuff that everyone loves

Angst- A bit dark with serious topics, an argument here and there, some deaths, and a lot of tears

Comedy- Ah, my specialty. Maybe add some straight after an angst to lighten the mood of the reader. Or not...

Smut- (͡° ͜ʖ ͡°)(͡° ͜ʖ ͡°)(͡° ͜ʖ ͡°)

Like I said before, it may be best to add a "-F" for fluff to the title of a story, to let your readers know what they're getting into- do this for all of the types (apart from comedy- it's not really a warning), and your audience will be grateful