Traditional Music -> https://www.sama3y.net/forum/
Alternative Music -> https://mideastunes.com/
Books -> https://www.abjjad.com/
Torrent Tracker -> https://www.arabp2p.net/
Have you checked blogs, podcast? Other platforms than YouTube?
Would the infrastructure in Syria support creators and consumers of original content?
Have you considered creating something?
A curious topic...
It posts videos (history, poetry, and similar) by Tameem Al-Barghouthi, a PhD in political sciences from Boston.
YouTube (so many Arabic channels to choose from)
Twitter (especially Saudi Twitter pops off)
More wholesome HN/Reddit clone: https://io.hsoub.com/
Surprisingly informative Facebook posts which you find through Arabic queries in Google search