D4 is a slog—what am I doing wrong?

I've been playing D4 for about 3 months now. I have 4 kids, a busy job, and travel a fair amount—so I don't have a TON of time to play. I've been able to log ~80 hours in the last few months, and my FO Sorc is still only level 92, and it just feels like a SLOG to get to level 100.

I feel like I'm doing something wrong, and I'd love some feedback.

I played D2 a TON when I was younger, so I'm quite familiar with that franchise. D2 was amazing. The stats and skill mechanisms were very straightforward, the gear made a ton of sense, and there was a sense of elation watching those bosses drop an SOJ or Frosties that I haven't quite discovered in D4 yet.

In Diablo 2, with 8 player party hell runs you could pretty rapidly get to level 99 in like 15-20 hours with almost any character class.

Diablo 4 has been a very, very different experience.

The game mechanics have taken a long time to learn (Imprinting v. rolling affixes v. Codex powers), the skills max out at level 50, and then the paragon board is an entirely new mechanism that is difficult to see how it actually impacts my character. And then on top of this, you can even upgrade the glyphs as well—which feels impossible to see or understand how any of this actually translates back to my character's ability to slaughter monsters.

And then there's the entire damage calculation that feels like you need a Phd to figure out. I'm not even going to comment on this.

My current strategy has been to do Hell Hoards and Nightmare Dungeons. I literally go from dungeon to dungeon, and I'm typically fighting dungeons with monsters 7-10 levels above my current level (i.e. if I'm level 90, I'm fighting in monster 97-100 dungeons).

I'm really burning out on D4.

I want to like it. I loved D2 so much, but D4 has generally been a big disappointment, and I'd really love some guidance on what I'm doing wrong? Or is this just how Diablo 4 works?

EDIT

Thank you to the few of you who took this question seriously. You've given me a number of wonderful ideas I'm excited to try out. You are proof that Reddit is not completely lost.

For everyone else—evidently, my exposing sincere vulnerability and asking for help is a massive faux paux and Reddit is not the place to do that—you all took it as an opportunity to cry "troll!" and tell me what an idiot I am. Thank you for adding zero value to the world.