I have the same problem here in Middle of the Europe (Czech Republic), tried all modes, it was in Friday/Saturday evening/night but without any success.
Really don't understand why can't find anyone who plays 4 year old game...
There are much older games, which are played yet today!
same for me buddy, I have been keep searching players for DLC mostly, very low chance no matter what time/day/ region. And I am in middle of Hutt mission in Bespin.. Maybe there is a forum somewhere on net where we can arrange sessions ? My location is East Europe-Poland (Ps4 version of game)