Had the same wall before me as you have, now I'm complaining, that the game is in most instances to easy. Some tipps that might help:

Take it slowly. By that I mean, explore everything, talk with everybody, do sidequests, think around the corner. Every skill is in the game for a reason e.g. speak to animals or dead. Don't rush into combat, the power curve is very much in your favor, but at the beginning you will struggle and fight some uphill batlles.

Make use of items like potions, scrolls and so on and dig a bit into alchemy. A few speed potions can turn a battle from suicide into a cakewalk. And remember, you can throw a lot of things, including enemies and potions (which results in a nice aoe heal).

Some early game spells are almost to good to be true, e.g. scantuary or command. Command grovel takes enemies completely out of the fight.

You want to have at least one character in the party, that can do burst damage. Laezel as a pure fighter is a strong option, I personally go with a paladin multiclass for my main because divine smite is almost to good to be true. The burst damage is really insane. If you feel more like a wizard, water + chromatic orb is really really strong.

Always gang up on enemies, take them down one at a time. An enemy with 1hp left is as deadly as an enemy at full health.

Make use of short and long rests, short rests provide a lot of healing and refresh the spell slots of warlocks, so a padlock or Wyll will always have options after short rests. And make sure you level up.

Shop till you drop, there many great early game items available for early game e.g. the ring of whispering promise (party bless on heal) or the caustic band. Don't be fooled by small addtional damage numbers, these things stack up to some impressive damage.

Always try to have advantage in combat, just check some tutorials.

Make sure that characters are proficient with the armors and weapons you give them, that makes a huge difference.

Look around, some encouters can be made a lot easier by using exploding barrerls conviently put next to enemies.

Call in the cavalery, you get three ogres fighting for you early in act 1.