I would paint the cabinets and walls. A great paint for cabinets is a brand called Fusion Mineral Paint. Lots of great colors, very durable, and very easy to use. Then change out the lighting, faucets, and if necessary the wall fixtures to something you will want when you remodel. That way everything can be re-used, and you can update each bathroom for a few hundred dollars.

https://fusionmineralpaint.com/

After looking at the pictures again, the trim, doors, and mirror frames should also be painted :).

Thank you for the paint recommendation!

You’re lucky to have such nice big bathrooms - they will look great with a facelift!