A cheap and easy way would be soul wars tie worlds, try world 9. You get 2 zeal each game and if you kill the NPCs in the game/train on players you get great exp.
I still need to do fremmy trials /: It's a fail account, got hacked for the def it has, so I'm making the best out of it . I still need dragon slayer too haha .
But thanks for advice, I will try that out as soon as I get around to fremmy trials