how to upload profile picture?

And you didn't receive any email about how long the ban lasts? This mostly happens when you try to upload a profile photo many times, therefore the system suspends you.

We just have to wait for the suspension to end!

i have tried again to upload a profile picture but it says i am still suspended.

Hi Kolin M! I hope you are well, delighted to be able to offer you my help!

Please confirm at https://enforcement.xbox.com/ if you no longer have any active suspensions.

If there isn't one, try changing your custom gamer skin using an Xbox app on mobile. Let me know if you could upload an image. Generally, it can take a few days before it is approved.

Best regards,
Daniel.

Because apparently the servers aren't enduring too much people.

The option has temporarily been disabled.

As people look to gaming for social connection, Xbox is seeing record numbers across Xbox Game Pass, Xbox Live, and Mixer. To streamline moderation and ensure the best experience for the community, Xbox has made small adjustments.
Some features like uploading custom gamerpics, club pics, and club backgrounds are temporarily disabled