One thing you might want to try is a little trick called "g rushing." It stands for glitch rushing and you can do it by being in haggorath and partied with someone who is doing the baal quest. They must meet the requirements for the baal quest and be in the worldstone chamber when baal is killed. At that time, if they complete the baal quest, so will you and you can progress without killing the ancients.
Find a few cow games in Normal or some Tomb-run games if no cow games are popping up untill lvl 25.
Then Baal run games where a group of you kill Baals minions, start a new game and repeat untill ~lvl40+. Loads of XP in an 8 player game. You should be gaining a lvl per time. Should be able to reach lvl 40 in a couple of hours or less if you're lucky.
You'll need to create another new character to view the 'Normal difficulty' game list then switch back to your main char and type the game name in the join game box. Just be aware that baal run games fill up quickly. Usually the game will be called something like Baal-01. Once the minions are killed everybody leaves the game and a new game Baal-02 will be created. If there is a higher lvl teleporting the game will last about 3 minutes.