Another 4 or 5 levels (which actually doesn't take long at the start of the fjords) and you should be able to boost dexterity enough for a decent bow. A mage can get a fair amount of mana from enchantments, but the regeneration rate isn't going to be great with a low intelligence (potions could help with that, and ingredients are easy to get once you have the battle tower).
In DKS the stat requirements were removed from equipment, so that lowers the barrier for switching playstyles.
If you do decide to start over, and want the greatest flexibility, focus on intelligence. There are magic based bows and melee weapons that take advantage of that stat, so you can more easily switch between or mix classes.
In D2:ED I focused on strength for my warrior, but boosted dexterity and intelligence a bit for the associated resistances. In DKS playing a ranger I focused on dexterity and have not put anything into intelligence (in a couple places stun arrows were a bit of a pain, though), but did boost strength a little (used some unarmed melee at the start, and strength helps your healing rate).
Skill Books/Stat Books/Dragon Skill Books CompleteSo: warrior, mage or archer?The official "ULTIMATE MAGE" guideAnyone help a newb with Warrior build ... ??? - DKS topic, so there are some minor changes from D2:ED, discussing warriors and a bit on rangers