Not enjoying the game : Damage is below for the auto scalable content. Many hours of gameplay

I have pre-purchased “Diablo IV” and played since early access.
My game experience playing Sorceress class is very bad. The damage it deals with the best gear that game gives me is very low, and it takes almost an hour to finish a dungeon and kill a Boss or monster on World Tier 1. At level 55 my Sorceress character does 200 damage with Basic skills as Fire bolt or Arc Lash in World Tier 1. The reference values from tooltip state they deal more than a thousand damage. The attack power is 1,800.
The referenced spell Firewall (tooltip says : 6,000 damage over 8 seconds) actually deal 100 ( one hundred) damage per tick , and stacking multiple Firewalls does not do any effect.
My Sorcess character is constantly out of mana, the legendary items (aspects) and Skill tree abilities that should provide mana does not work. My character carry ALL possible (currently available 3) types for mana / resource restoration for Sorceress class and they do not work.
How I am expected to play and enjoy this game ?
I do not enjoy this at all. It took already too much of the lifetime to play the content. And the difficulty scales each time my character progress in levels. The fights on my character are too long. Investing more life time on this is meaningless.
Can you look into the issue ?
Is this somehow related that someone modified my character at to deal less damage ?
Otherwise , I can not understand how is this possible that character in good gear is performing that poorly versus a simple enemies.
Experience is not the same as Diablo III. I could recall Diablo IV is similar to Last ARK.