Yeah, I have to join the others in saying that you are rubbing against natural difficulty curve. Perhaps you are not using enough buff/debuff, crowd control tools. I you are struggling that would be time to take a good look at your items and spells and clean up your hotbars, if so far you were relying on a handful of skills only. I never had an issue with Gnolls (the fight by the cave is a bump in difficulty, but not to the point where I would loose), but I remember having to really re-examine my skills and inventory when fighting the enemies by the map exit near Waukeen’s Rest.
As you are playing Wizard I would suggest looking through your repertoire and seeing if your spells aren’t too one note - if every spell you memorised is resisted by same attribute, if you encounter enemies with this specific high attribute you might find it hard to be effective.
You probably have a pile of potions/scrolls. Drink/throw/cast them if needed.
