Minecraft Bauiden survive in?

Re
- in Worlds
2

In my survival world I have a big house in the roof is a village village, in the basement I started building farms, in a side wing there's a stable for horses and donkeys, but unfortunately there are still many free spaces which I do not use. I already have a room with my fighting equipment, one with a magic table and bookshelves, one with a brewing stand, two bedrooms. In addition to the many vacant rooms, I would like other suggestions for buildings if possible.

I have enough building materials, I have all kinds of plants except bamboo and cocoa. I have access to the Nether and End.

Greetings silane

PS: We play in pairs in the world. And none of the farms is automated.

Hu

How about a tunnel system or a safe?

Re

First of all thank you for your answer and a tunnel system is a good suggestion since I only have a small one. Vault is also an option but I probably won't consider it…