How to Increase the Storage Space at my manor?

You need to build storage units so you can store your items in your manor. You’ll start off with small cabinets that only has 12 slots, followed by Wine Cabinets with 18 slots. Wine Cabinets are unlocked once your manor level reaches LV3 but you’ll be able to build one for free when starting. If you happen to get a formula for Bookcase, you can build it to get 20 slots of space. Later on, you’ll be able to create a Solid Closet with 22 slots at Manor LV5, and better storage units as you unlock more formula or reach higher manor level. You can create as many cabinets, bookcases, or closets as you want.

When placing your storage units, I suggest putting them all in the same floor. That way, you can easily toggle between them without manually checking out each and every one of them.

You can also opt to leave some items that you shipped from your adventures in your mailbox until you need them. They items in your mailbox expire after 60 days so this is more than enough time to leave them there. This will also allow you to store the items you purchased, crafted, or awarded to your cabinets.