I am fairly new to the game and am looking for friends on xbox to play with!
Don't expect too much friendship on either platform but I'd say at least try posting on in of the communities on console.
You might get lucky just running into or approaching someone in a safe zone.
Some weird things happen good and bad in game .
I play on PS4 but was approached to party with some people from Xbox and they were cool .
Then some people from PS4 kept killing me at boss for no reason one day.
Guilds can be a bit overhyped too.
Don't depend on consistently fair treatment from them.
Good luck though.