If I could choose for you, then balanced 2 hand or polearm (you seem to be a very good dueler). But just do what you enjoy the most since it takes many many months. I am gen 6 and my only ever polearm gen is this one that I just reach 34 with last week. Must have taken nearly 6 months?
Also remember theres nothing stopping people taking alts when you feel like a change now since you can trade stuff between chars, so no need to go ultra multi class, just use alts. If you use alts once you reach your goal with your main you can help fund him by retiring other chars