Hey there,
The Just for you section won’t always have anything in it.
Only if there is a specific offer of something for you. Especially if you already have a lot of the older content.
I haven’t had anything in the Just for you section since season 2. But I also have almost all OW1 content and a good chunk of OW2 content myself.
As long as you see everything that is available in the shop in the other sections it is not unusual for that one section to be empty.