Easy way to upgrade machines

Hi all - we have thousands of systems which is in the process of upgrade and our SCCM Admins are using software center to push these updates. SCCM DP is hosted on corporate network but since users are working from home the updates are going via WAN and failing apart and update process is not successful.

If there is any more easier way to update windows from 1809 to 1909 like usb, iso, copy the task sequence file etc ? any sort of easier way to upgrade these machines for remote users.