As someone who just did the renowned grind and Lilith statue hunt, and who also finished the campaign day 2, here are some tips and tricks.

• -Do not do side quests unless you really like the story. You are better off doing all of the dungeons as they give 30 renown a piece and there are like 20 to 30 in each region. This also unlocks all the aspects which you will want and need for your main and alts anyways. And they are incredibly fast and easy while giving you much-needed gear very quickly.

  
  

• -Focus on the campaign. You will pretty much level to 45 doing nothing but the campaign. And you will get your mount sooner which will make the game incredibly more bearable. It's honestly the best bet for time efficiency.

  
  

• -Use a map to find the Lilith statues as you level. This alone will buff your character's damage and survivability so much that you will probably one-shot everything. If you don't want to use a 3rd party source. Blizzard for whatever reason put almost every statue in these little pockets that all look identical. Or on an island, you jump to. Either way, getting those statues is the most powerful way to go through the game.

  
  

• -Don't overanalyze gear before world tier 3. If it's green, equip it and move on.

• -Drink potions for the exp bonus. It is so easy to loot them or make them and it's honestly such a crazy time saver.

• -Wait until you have your mount to fully explore regions. And grab Lilith statues on your way through the game, don't run across the entire map for 2 to an off-stat or max obols.

• -Play the build that has the most dungeon aspects tied to it early. For example, Druid has 3 shred aspects in the starting zone. Necro has bone lance, etc, etc. Respecs are easy and the D4 gold cost is negligible.

  
  

• -The actual game starts after the campaign and or level 45. Do the campaign, and get better loot from side quests and dungeons on harder world tiers. That being said I would prioritize doing dungeons for renown.

• -You can easily get to world tier 3 even in terrible gear. Don't be afraid to try. We got into world tier 4 at like level 54 and it was a level 70 capstone.

• -Synergize your build, if you are playing druid and you get a billion forms of crit damage, stack crit and crit damage and aspects that give it. Overpower? Fortify and max health. Don't try to be a jack of all trades. A tiny multiplier in the early game will allow you to one-shot most things.