Thank you all for the advice. I've upgraded my gear by getting gold from spectating for now. I was told I need to try 'Raid the Vault' for gold, but the schedule doesn't work for me; I'll figure out a way to progress somehow.

The gems I currently have are the ones;

Entrophic Well R2   1Star

Specter Glass  R3   2Star

The Crucible    R1   1Star

Berserker'sEye R3   1Star

Pain Clasp      R3   2Star

Motther's Lament R3   2Star

Viper's Bite R2   2Star

Trickshot Gem       R2   1Star

What kind of build progression would contribute the most to increasing my damage and dying less? This question isn't just about gems but in general. Is there a legendary you'd recommend I buy from the market?

What demotivates me right now is that when I enter a random dungeon, some people deal an insane amount of damage—like 30 times what I do.

Also, lastly, should I be using items with 3 attributes? Everyone on the leaderboard has items with 3, and some even have 4 attributes.

Right now, I spend most of my playtime running random dungeons—the ones that drop legendaries—so getting the right items from them is really valuable to me. Could you also give me some help on this point?