My Series S won't update Microsoft Store or install new games.

So i was having a glitch of not being able to update Microsoft Store, so I factory reset my console, first with keeping my games and apps, then, with delete everything but now I can't install anything, takes a lot of time to load, and the download speed decreases until the installation is stoped. I'm thinking it has something to do with my NAT, but it was always normal, is connected to the router via ethernet. I contacted Microsoft Support and they didn't help, their solution was repairing my console. I need to know how to fix this or of someone else is having this issue.

I deleted caché as well. so don't tell me to do that, please.

:)