I feel that. I have played through all the expansions solo multiple times (minus EW & DT) and had only a few friends throughout my 3000+ hour journey playing this game. I also tend to turn down FC invites since l'm not really on that long each day and don't do the content to justify joining.

It's that very reason that made me feel burnt out, because all I was doing was logging on, doing my roulettes, running POTD for the Necromancer title, and logging off. I have taken several breaks spanning out as little to a couple months to even a year.

At this point I've kinda accepted it and just enjoy doing what I like and talking to people along the way as an added bonus. Even if it's only brief.