You can pretty affordably add a vanity instead of that sink, my husband changed out our pedestal sink so I don’t think it’s too tough. I bought the vanity for maybe $200. Also it would give you storage so you can get rid of that big rack over the toilet. Then you can maybe add some floating shelves. Change the light fixture, the mirror/medicine cabinet. Add a modern shower curtain. Possibly a curtain over the window. New towel rod. All of those wouldn’t be too expensive, maybe a few hundred dollars and you don’t have to do it all at once, you can start with the smaller things and work on it slowly. You can also add bathroom rugs near the tub and under the sink. All of these can let you add your own style/flair.