I read somewhere that it's possible to buy a new shop/gallery for 150 000 sP, but I can't find the feature. I'm already using my four shops and while I am planning to delete one of them to make room for a gallery, I still have ideas for a fifth shop/gallery ...
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i don't think that's possible ;; afaik the only way to get more shops is by having a gold account
You'll need a GA BUT once you have the GA, even if it's a week, you'll have the shop. Same for if you want another pet and you're using all your basic account pet slots, you'll still have the slot.
Hope that makes sense and helps. c:

I was wondering about that, I didn't have the guts to add a shop on my gold week because I was afraid it would be gone when the week ended.
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Nope, the only way that would remotely happen would be if you - personally and purposely - went in and deleted the shop after its creation.

Gonna chime in to correct something to avoid confusion - pet slots are not tied to a GA. They haven't been for years - since about 2015, to be exact. This was a very old mechanic that's been removed from the game. If you haven't hit the pet slot limit, you can buy and use petslots whenever you please!
It used to be many years ago possible to have lots of shops by buying more with sP. There was no necessary reason a user needed to, because they had no limit on size either. Did you read it on a wiki so that it can now be changed, or did you dig it out of old old forums?
I found it here: https://subeta.fandom.com/wiki/User_Shops
and that site hasn't been useful for me at all. Usually it's just the same text that I can find here, but now finally I saw something adding to the info I could find out on my own, and it's not even correct xD
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there's not very many people working on that wiki right now, and it never had a lot. I will see if it allows some editing. It used to be more useful because the FAQ here used to be pretty pathetic. There is a fansite called SubetaLodge, and they do keep themselves up to date on the things that they do cover.