What is the best way to keep a bathroom smelling fresh between deep cleans?

I clean my bathroom regularly but it never seems to stay fresh for very long. After a couple of days I start noticing a stale smell even though the sink toilet and floor all look clean.

I already wipe down the surfaces and empty the trash often but I feel like I am missing something in my routine. I would rather prevent odors from building up than rely on air fresheners to cover them.

What small habits or cleaning routines have made the biggest difference for keeping your bathroom fresh every day I would love to hear tips that are simple and easy to keep up with.