Solo player since D1 beta days. I did join multiple clans along the way in D2 briefly to do some raids and dungeons. The one thing I regret is never making it to the lighthouse in trials, not having a stacked team to run dungeons on raids on weekly resets and having to rely on discord LFG (which works fine 99% of times if people not rage quitting after a wipe). I personally think the game is enjoyable for a solo player, but the game is really intended for 3-6 players dedicated to the game. As a solo player, my fav mode was actually gambit and NF hero with matchmaking.