Do you have a vanity? Space on the walls for a small cabinet? Floor space for a cart? I’ve seen people put a shelf over the bathroom doorway for storage.

Get the largest vanity that will fit. Racks over the toilet.

Here is my very small guest bath in my Florida home. That bottom drawer hold 8

hand towels.

We have a linen closet down the hall from this bathroom.

When we bought this home, the previous owner had two towel barson the door plus

a small one over the toilet.

We didn't find this necessary but it's like storing towels in plain sight.

Also notice we chose a left offset sink.

Maybe post some pictures so people can get more of an idea? There are lots of ready-made cabinet options for ‘above-toilet storage,’ and it’s always easy to put hooks for towels on the back of doors or cramped wall spaces.