There is a good collection of hobby space and storage ideas here-

• Amazon Basics Dropper bottle Paint Rack, hold up to 64 paint bottles
• How to make custom Paint shelves
• Wall mounted wood paint racks
• How to Organize your Paints by Bird with a Brush
• The best portable paint storage options by Tangible Day
• Nail polish racks make great cheap paint storage, also available in Wall mounted options
• Paint Storage options
• Ikea Hack: Converting drawers into organized paint storage by RW Hobbies
• I made a paint rack for £30 by RisingApe