Yep, that's probably what happened, as I suggested. Sorry about that, Forward.
If that's any consolation, most of your stuff was probably average at best by today's standards. Season 4 was 7 seasons ago. So many items and skills have been reworked, retooled or added that your then-top-notch gear is not worth much today. While changes to set items carry over from patch to patch on your looted set items, changes to orange legendaries aren't. You need to reloot them to get the new effects. And whatever materials you amassed back in S4, you can probably get much faster now.
I'm not sure what you were asking in your original post, but if you're asking if the DLC is worth it for someone who's fundamentally bored with the game, I'd say no. It's a new class, and it's fun, but the base game is the same, and every single bit of content that's not directly related to the Necromancer is free. Heck, you can even get a taste of the necromancer some weeks in challenge rifts. In fact, you can try a specific necro build right now until Monday, so hurry up! Just start a game and choose "Challenge Rift" instead of Campaign or Adventure. Challenge Rift Mode pits you in a specific greater rift with a specific character. You can't change his skills or equipment, and the layout and enemy placement of that GR stays the same. If you complete it under the given time limit, you get a item cache. You can compete with other players for the best time. It's a novelty mode honestly, but it's a fun weekly diversion, and you get to try the Necro whenever he's on the rotation. It's $15 by the way, not $20.
However, if you're asking "has anything changed since Season 4", then yes. Again, many legendaries were added or reworked. Legendaries too, and a few new features. Will that be enough to hold your attention? No idea. You should give it a try.
